Stephan 2017
Stephan 2017
Abstract
Walking speed is one marker of health in adulthood. Although personality may contribute to gait speed, there is limited
longitudinal data on this association. Thus, the present study examined whether personality traits are prospectively associated
with walking speed among middle aged and older adults. Participants were adults aged from 25 to 100 years old (N > 15,000)
drawn from the Wisconsin Longitudinal Study Graduate and Sibling samples, the Midlife in the United States Survey, the
Health and Retirement Study, and the National Health and Aging Trends Survey. Across most samples and in a meta-analysis,
lower neuroticism and higher extraversion, conscientiousness, and openness at baseline were prospectively related to faster
gait speed. In the HRS, lower neuroticism and higher extraversion, conscientiousness, and openness were related to slower
gait speed decline. This study provides robust evidence that walking speed in adulthood reflects, in part, the individual’s
personality.
Keywords
personality, walking speed, adulthood
Walking (or gait) speed is considered one marker of an                 adulthood (Buchman et al., 2013; Canada, Stephan, Jaconelli,
individual’s health (Studenski, Perera, Wallace, et al., 2003;         & Duberstein, 2016; Krueger, Wilson, Shah, Tang, & Bennett,
Studenski, Perera, Patel, et al., 2011). Longitudinal research         2006; Stephan, Sutin, Canada, & Terracciano, 2017; Suchy,
finds consistently that slower gait is predictive of a range           Williams, Kraybill, Franchow, & Butner, 2010; Terracciano,
of deleterious outcomes, including poor mental health                  Stephan, Luchetti, Gonzalez-Rothi, & Sutin, in press; Tolea,
(Demakakos et al., 2013), higher risk of incident functional           Costa et al., 2012). Higher neuroticism and lower extraversion,
limitations and disability (Cesari et al., 2009; Perera et al.,        openness, and conscientiousness are related to lower self-
2016), impaired cognition and incident dementia (Dumurgier             reported physical functioning (Canada et al., 2016; Duberstein
et al., in press; Verghese, Wang, Lipton, Holtzer, & Xue,              et al., 2003; Suchy et al., 2010) and are risk factors for objec-
2007), and ultimately higher mortality risk (Studenski, Perera,        tively assessed poor muscle strength (Tolea, Terracciano, Mila-
Patel, et al., et al., 2011). A large range of factors that contrib-   neschi, Metter, & Ferrucci, 2012), worse respiratory function
ute to gait speed have been identified from biological to social       (Terracciano, Stephan, Luchetti, Gonzalez-Rothi, & Sutin, in
(Brunner et al., 2009; Rosso et al., 2015). The present study          press), impaired aerobic capacity (Terracciano et al., 2013),
focused on the extent to which walking speed reflects individ-         and steeper motor declines (Buchman et al., 2013). The find-
uals’ characteristic ways of thinking, feeling, and behaving,          ings are more mixed for an association between agreeableness
that is, their personality traits.                                     (the tendency to be cooperative and altruistic) and either self-
   There is extensive evidence for the association between per-        reported or objective measures of physical function (Canada
sonality and health across the life span (Friedman & Kern,             et al., 2016; Terracciano et al., in press).
2014). Based upon the five-factor model (FFM; Digman,
1990), neuroticism (the tendency to experience distress and
                                                                       1
negative emotions), extraversion (the tendency to be sociable              Euromov, University of Montpellier, Montpellier, France
                                                                       2
and to experience positive emotions), openness (the tendency               College of Medicine, Florida State University, Tallahassee, FL, USA
to search for variety and to entertain new ideas), and conscien-
                                                                       Corresponding Author:
tiousness (the tendency to be self-disciplined and organized)          Yannick Stephan, EA 2991 Euromov, University of Montpellier, UFRSTAPS, 700
have been related to both self-reported and performance-               Avenue du Pic St Loup, 34090 Montpellier, France.
based measures of physical and motor functions across                  Email: yannick.stephan@umontpellier.fr
774                                                                                    Social Psychological and Personality Science 9(7)
Table 1. Baseline Characteristics of the Samples and Correlations of Study Variables With Walking Speed at Follow-Up.
Age (years)           53.19 0.62       .06**     52.53 6.84      .30**      46.23 11.76       .22**     71.19 6.80      .30**     78.26 6.97      .41**
Sex (% women)          54% —            .14**      53% —           .14**       55%   —           .11**      58% —           .13**      57% —           .16**
Race (% White)        100% —             —        100% —            —          95%   —           .01        89% —           .17**      76% —           .22**
Education         13.86 2.37             .22**    14.03 2.53         .23**     7.56     2.42      .18**    12.92 2.78        .23**      5.42 2.25       .32**
Walking speed      1.02 0.25              —        1.03 0.26          —        1.11     0.22       —        0.83 0.29         —         0.77 0.26        —
  (m/s)
Neuroticism        3.17 0.98           .09**      3.22   0.95    .09**       2.20     0.66    .03        1.98   0.58    .08**       2.18   0.83   .05
Extraversion       3.86 0.89            .08**      3.78   0.91     .09**       3.21     0.55     .02        3.24   0.54     .12**       3.19   0.73    .11**
Openness           3.67 0.80            .11**      3.63   0.75     .09**       3.06     0.50     .02        2.96   0.54     .15**       2.87   0.81    .18**
Agreeableness      4.76 0.74           .02        4.71   0.72    .04         3.47     0.48    .09*       3.55   0.45     .00         3.60   0.51    .02
Conscientiousness 4.87 0.67             .06**      4.76   0.71     .04         3.46     0.43     .05        3.39   0.45     .14**       3.28   0.68    .18**
Note. See Method section for differences in the assessment and coding of walking speed, personality, and education in each sample. rWalking Speed ¼ Pearson cor-
relation between baseline variables and walking speed at follow-up. Wisconsin Longitudinal Study Graduate (WLSG): N ¼ 4,603; Wisconsin Longitudinal Study
Sibling (WLSS): N ¼ 2,090; Midlife in the United States Survey (MIDUS): N ¼ 990; Health and Retirement Study (HRS): N ¼ 5,966; National Health and Aging
Trends Survey (NHATS): N ¼ 1,919.
*p < .01. **p < .001.
5,966 participants (Table 1). In addition, 4,383 individuals also                Covariates. In the five samples, age, sex, and education were
had walking speed data at baseline. More information about                       specified as control variables a priori. Education was reported
HRS and how to access the data can be found at http://hrsonli                    in years in the WLSG, the WLSS, and the HRS and measured
ne.isr.umich.edu/index.php. Attrition analysis are presented in                  on a scale ranging from ranging from 1 (no grade school) to
the Online Supplemental Material.                                                12 (doctoral level degree) in the MIDUS. In NHATS, a scale
                                                                                 ranging from 1 (no schooling completed) to 9 (master’s profes-
                                                                                 sional or doctoral degree) was used. Race was controlled in the
Personality. In the WLSG and the WLSS, a 29-item version of
                                                                                 MIDUS, the HRS, and the NHATS and was coded as 1 for
the Big Five Inventory (John, Donahue, & Kentle, 1991) was
                                                                                 White and 0 for Other.
used. Participants were asked whether they agreed or disagreed
with descriptive statements using a scale ranging from 1 (dis-
agree strongly) to 6 (agree strongly). In the MIDUS and the                      Data Analysis
HRS, personality traits were assessed using the Midlife Devel-
                                                                                 Regression analyses were conducted to examine the relation
opment Inventory (MIDI; Lachman & Weaver, 1997). In the
                                                                                 between personality and walking speed. In each sample, walk-
MIDUS, participants were asked how much 25 adjectives that
                                                                                 ing speed at follow-up was predicted by baseline personality,
assessed neuroticism, conscientiousness, extraversion, open-
                                                                                 controlling for demographic factors. Each trait was examined
ness, and agreeableness described themselves on a scale rang-
                                                                                 separately and then simultaneously in supplemental analysis.
ing from 1 (not at all) to 4 (a lot). The same scale was used in
                                                                                 A supplementary analysis was also conducted controlling for
the HRS, with 1 additional item. Cronbach as ranged from .58
                                                                                 disease burden. The results from the five samples were com-
to .80 across the four samples. A 10-item version of the MIDI
                                                                                 bined in a random effects meta-analysis using sample size and
was used in NHATS, using two adjectives for each of the five
                                                                                 p value from regression models with each trait examined sep-
traits. Participants answered on the same 4-point scale.
                                                                                 arately. Heterogeneity of results across the five samples was
                                                                                 examined using the Q test. The meta-analysis for each trait was
Walking speed. Walking speed was measured using a 2.5-m                          conducted with the Comprehensive Meta-Analysis software
course in the WLSG, the WLSS, and the HRS, a 15.24-m span                        (https://www.meta-analysis.com/). In the HRS and the
in the MIDUS, and a 3-m span in the NHATS. In each study,                        NHATS, we also examined the association between personality
participants were asked to walk at their normal pace. The best                   and change in walking speed. Residualized change analyses
of two trials was taken. Participants with at least one perfor-                  using regression were conducted to predict walking speed at
mance were included. Speed was calculated by dividing the                        follow-up from baseline personality, demographic factors, and
distance (in m) by the time recorded (in s). Participants with                   baseline walking speed. Significant findings would suggest that
values 3 standard deviations above and below the mean were                       personality is associated with changes in walking speed
removed before conducting the analysis (WLSG: N ¼ 27;                            because it represents the effect of personality after controlling
WLSS: N ¼ 2; MIDUS: N ¼ 9; HRS: N ¼ 6; NHATS: N ¼ 5).                            for earlier levels of walking speed.
776                                                                                                                                                                                                     Social Psychological and Personality Science 9(7)
Heterogeneity Q
                                                                                                                                                                                                                                                                                          Note. Coefficients are standardized regression coefficients. 95% confidence intervals are in parentheses. Wisconsin Longitudinal Study Graduate (WLSG): N ¼ 4,603; Wisconsin Longitudinal Study Sibling
approach was taken by setting p to <.01 for all analysis.
                                                                                                                                                                                                                                           15.39*
                                                                                                                                                                                                              4.65
4.69
4.63
                                                                                                                                                                                                                                                                      7.70
                                                                                                                                                                            Meta-Analysis
                                                                                                                                                                                                                                                                                          (WLSS): N ¼ 2,090; Midlife in the United States Survey (MIDUS): N ¼ 990; Health and Retirement Study (HRS): N ¼ 5,966; National Health and Aging Trends Survey (NHATS): N ¼ 1,919.
Results
Table 1 presents the correlations between the demographic
                                                                                                                                                                                                              [0.083, 0.048]
variables and personality traits at baseline with walking
Random Effect
[0.073, 0.108]
[0.018, 0.083]
[0.005, 0.040]
                                                                                                                                                                                                              [0.060, 0.106]
speed at follow-up. Table 2 presents results of regression
.06**
.09**
                                                                                                                                                                                                                    .08**
                                                                                                                                                                                                                    .05*
analyses with personality traits at baseline predicting walking
                                                                                                                                                                                                                    .02
speed at follow-up controlling for the demographic covari-
ates. Comparison of Tables 1 and 2 suggests that the pattern
                                                                                                                                                                                                                                                                                           Adjusted for age, sex, and education. bAdjusted for age, sex, education, and race. cAdjusted for age, sex, education, race, and time elapsed between assessments.
of associations between personality and walking speed were
similar with or without the demographic factors included.
[0.073, 0.004]
                                                                                                                                                                                                              [0.008, 0.069]
The results were mostly consistent with our hypothesis: The
[0.030, 0.105]
[0.047, 0.124]
                                                                                                                                                                                                              [0.070, 0.146]
meta-analysis and findings from most of the individual sam-
                                                                                                                                                                                            c
                                                                                                                                                                                            NHATS
.07**
.09**
                                                                                                                                                                                                                   .11**
ples indicated that lower neuroticism and higher extraver-
.03
                                                                                                                                                                                                                   .03
sion, conscientiousness, and openness were related to faster
gait speed. Additional analysis controlling for disease burden
revealed no change in the overall pattern of relations in the
five samples (see Supplemental Table S1). When all traits
                                                                                                                                                                                                              [0.104, 0.057]
were entered simultaneously, conscientiousness remained a
[0.088, 0.134]
[0.053, 0.101]
[0.007, 0.055]
                                                                                                                                                                                                              [0.082, 0.129]
significant predictor of walking speed across all samples, and
.08**
.11**
.08**
                                                                                                                                                                                                                    .11**
higher extraversion was related to faster speed in all but one
                                                                    Table 2. Summary of Regression Analysis Predicting Follow-Up Walking Speed From Baseline Personality.
                                                                                                                                                                                            b
                                                                                                                                                                                            HRS
                                                                                                                                                                                                                    .03
of the samples (see Supplemental Table S2).
   The effect size of the significant associations between
personality traits and walking speed were about one third the
effect of age and were similar or larger than the effect of sex.
For example, in the HRS, the effect of conscientiousness (bs ¼
                                                                                                                                                                                                              [0.120, 0.003]
[0.066, 0.056]
                                                                                                                                                                                                              [0.099, 0.024]
                                                                                                                                                                                                              [0.001, 0.121]
                                                                                                                                                                                                              [0.001, 0.122]
.11) was about one third of the effect of age (bs ¼ .28), and 1
                                                                                                                                                                                            b
.06
.06
.00
.04
                                                                                                                                                                                                                    .06
an age difference of 2.5 years in walking speed. To provide
an additional illustration of effect sizes, Figure 1 depicts
walking speed among individuals with scores on extraversion
and conscientiousness 1 SD above and below the mean.
Adjusted for demographic factors, individuals with higher
                                                                                                                                                                                                              [0.105, 0.024]
[0.034, 0.052]
[0.023, 0.058]
[0.023, 0.103]
.06*
                                                                                                                                                                                                                    .06*
                                                                                                                                                                                                                    .01
.02
[0.018, 0.078]
[0.030, 0.086]
.05**
.07**
                                                                                                                                                                                                                    .06**
                                                                                                                                                                                            WLSG
.05*
nor age were consistent moderators across the five cohorts (see
                                                                                                                                                                                                                    .02
                                                                                             Discussion
     A
                                  1.2                               High Extraversion (1     Based on five large longitudinal samples of middle-aged and
                                                                    SD above the mean)
                                  1.1
                                                                                             older adults, the present study found that personality prospec-
                                                                    Low Extraversion (1 SD
                                                                                             tively predicts walking speed. Consistent with our hypotheses,
            Walking Speed (m/s)
neuroticism is associated with a range of health-damaging              regression to test for the link between personality and changes
behaviors, such as smoking (Hakulinen et al., 2015) and seden-         in walking speed, other ways of modeling change over two
tary behavior (Sutin et al., 2016) and higher disease burden           waves, such as latent change score models within a structural
(Weston et al., 2015) and depressive symptoms (Hakulinen               equation model framework, may prove useful.
et al., 2015) that may result in walking limitations and slower           In conclusion, this study provides evidence that personality
speed. In addition, higher conscientiousness and openness are          traits prospectively predict walking speed and walking speed
associated with better cognitive function, whereas neuroticism         decline among middle-aged and older adults. The findings
is related to worse cognition (Luchetti et al., 2016) and extra-       were mostly consistent across the five cohorts and personality
version is related to faster processing speed (Pearman, 2009).         was a prognostic factor for walking speed performance across
Neuroticism, extraversion, openness, and conscientiousness             short and long-term follow-up, up to 18 years. Thus, person-
may also be related to gait speed through biological pathways.         ality assessments may provide some information about who
Individuals with lower neuroticism, higher extraversion, open-         is at risk of poor physical function across adulthood, which
ness, and conscientiousness, for example, experience less phy-         may be targeted by preventive programs designed to reduce
siological dysregulation (Stephan et al., 2016) and have better        mobility limitations and ultimately promote independent
cardiorespiratory fitness and energy (Terracciano et al., 2013),       living in older age.
which are associated with faster walking speed (Richardson
et al., 2015; Rosso et al., 2015).                                     Declaration of Conflicting Interests
    The association between personality traits and walking             The author(s) declared no potential conflicts of interest with respect to
speed among middle-aged and older adults suggest that how              the research, authorship, and/or publication of this article.
fast an individual walks can be considered an expression or a
motor signature of personality. Specifically, extroverted, con-        Funding
scientious, open, and emotionally stable people are character-
                                                                       The author(s) received no financial support for the research, author-
ized by faster gait. Furthermore, walking speed may function
                                                                       ship, and/or publication of this article.
as an intermediate, motor marker of the risk of poor outcomes
associated with some personality traits. Indeed, slow gait is pre-
                                                                       Supplemental Material
dictive of a higher risk of functional limitations (Cesari et al.,
2009), incident dementia (Dumurgier et al., in press), and             The supplemental material is available in the online version of the
higher mortality risk (Studenski, Perera, Patel, et al., et al.,       article.
2011). Personality traits in general, and high neuroticism and
low conscientiousness in particular, are related to difficulties       References
in activities of daily living (Suchy et al., 2010) and risk of         Agmon, M., & Armon, G. (2016). A cross-sectional study of the asso-
Alzheimer’s disease (Terracciano et al., 2014) and mortality              ciation between mobility test performance and personality among
(Jokela et al., 2013). Thus, it is likely that the risk of poor out-      older adults. BMC Geriatrics, 16, 105. doi:10.1186/s12877-016-
comes associated with high neuroticism and low conscientious-             0272-8
ness may manifest at the motor level, through slower gait.             Brunner, E., Shipley, M., Spencer, V., Kivimaki, M., Chandola, T.,
    The present study has several strengths including the                 Gimeno, D., . . . Marmot, M. (2009). Social inequality in walking
examination of five large samples, prospective analyses,                  speed in early old age in the Whitehall II study. The Journals of
long-term follow-up, and the investigation of all five major              Gerontology Series A: Biological Sciences and Medical Sciences,
dimensions of personality. Each sample was large enough to                64, 1082–1089. doi:10.1093/gerona/glp078
provide sufficient power to detect small effect sizes. How-            Buchman, A. S., Boyle, P. A., Wilson, R. S., Leurgans, S. E., Arnold,
ever, there are also several limitations. The observational               S. E., & Bennett, D. A. (2013). Neuroticism, extraversion, and
design of this study limits the possibility of determining cau-           motor function in community-dwelling older persons. The Ameri-
sal relations. Although personality was considered a predictor            can Journal of Geriatric Psychiatry, 21, 145–154. doi:10.1016/j.
of walking speed, future research may consider the potential              jagp.2012.10.015
reciprocal relation between personality and gait speed.                Canada, B., Stephan, Y., Jaconelli, A., & Duberstein, P. R. (2016). The
Despite the finding of a consistent association between per-              moderating effect of chronological age on the relation between
sonality and walking speed over different periods, from 1 to              neuroticism and physical functioning: Cross-sectional evidence
almost 20 years, the size of this association was relatively              from two French samples. The Journals of Gerontology Series B:
small. However, walking is a complex behavior that reflects               Psychological Sciences and Social Sciences, 71, 35–40. doi:10.
a wide range of biological, clinical, behavioral, cognitive, and          1093/geronb/gbu083
environmental factors, and each factor has a small effect.             Cesari, M., Kritchevsky, S. B., Newman, A. B., Simonsick, E. M.,
Therefore, personality is unlikely to have a strong effect. In            Harris, T. B., Penninx, B. W., . . . Pahor, M. (2009). Added value
addition, the personality measures were different across sam-             of physical performance measures in predicting adverse health-
ples and all of them were brief. Detailed personality question-           related events: Results from the health, aging, and body composi-
naires are needed to examine the personality facets associated            tion study. Journal of the American Geriatrics Society, 57,
with walking speed. Finally, although the present study used              251–259. doi:10.1111/j.1532-5415.2008.02126.x
Stephan et al.                                                                                                                                779
Demakakos, P., Cooper, R., Hamer, M., de Oliveira, C., Hardy, R.,         Luchetti, M., Terracciano, A., Stephan, Y., & Sutin, A. R. (2016).
   & Breeze, E. (2013). The bidirectional association between                Personality and cognitive decline in older adults: Data from a
   depressive symptoms and gait speed: Evidence from the                     longitudinal sample and meta-analysis. The Journals of Gerontol-
   English Longitudinal Study of Ageing (ELSA). PLoS One, 8,                 ogy Series B: Psychological Sciences and Social Sciences, 71,
   e68632.                                                                   591–601. doi:10.1093/geronb/gbu184
Digman, J. M. (1990). Personality structure: Emergence of the             Pearman, A. (2009). Basic cognition in adulthood: Combined effects
   five-factor model. Annual Review of Psychology, 41, 417–440.              of sex and personality. Personality and Individual Differences,
   doi:10.1146/annurev.ps.41.020190.002221                                   47, 357–362. doi:10.1016/j.paid.2009.04.003
Duberstein, P. R., Sörensen, S., Lyness, J. M., King, D. A., Conwell,    Perera, S., Patel, K. V., Rosano, C., Rubin, S. M., Satterfield, S.,
   Y., Seidlitz, L., & Caine, E. D. (2003). Personality is associated        Harris, T., . . . Newman, A. B. (2016). Gait speed predicts incident
   with perceived health and functional status in older primary care         disability: A pooled analysis. The Journals of Gerontology Series
   patients. Psychology and Aging, 18, 25–37. doi:10.1037/0882-              A: Biological Sciences and Medical Sciences, 71, 63–71. doi:10.
   7974.18.1.25                                                              1093/gerona/glv126
Dumurgier, J., Artaud, F., Touraine, C., Rouaud, O., Tavernier, B.,       Richardson, C. A., Glynn, N. W., Ferrucci, L. G., & Mackey, D. C.
   Dufouil, C., . . . Elbaz, A. (2017). Gait speed and decline in gait       (2015). Walking energetics, fatigability, and fatigue in older
   speed as predictors of incident dementia. The Journals of Gerontol-       adults: The study of energy and aging pilot. The Journals of
   ogy Series A: Biological Sciences and Medical Sciences, 72,               Gerontology Series A: Biological Sciences and Medical Sciences,
   655–661. doi:10.1093/gerona/glw110                                        70, 487–494. doi:10.1093/gerona/glu146
Friedman, H. S., & Kern, M. L. (2014). Personality, well-being, and       Rosso, A. L., Sanders, J. L., Arnold, A. M., Boudreau, R. M., Hirsch,
   health. Annual Review of Psychology, 65, 719–742. doi:10.1146/            C. H., Carlson, M. C., . . . Newman, A. B. (2015). Multisystem
   annurev-psych-010213-115123                                               physiologic impairments and changes in gait speed of older adults.
Gale, C. R., Allerhand, M., Sayer, A. A., Cooper, C., & Deary, I.            The Journals of Gerontology Series A: Biological Sciences and
   J. (2014). The dynamic relationship between cognitive func-               Medical Sciences, 70, 317–322. doi:10.1093/gerona/glu176
   tion and walking speed: The English Longitudinal Study of              Stephan, Y., Sutin, A. R., Canada, B., & Terracciano, A. (2017). Per-
   Ageing. Age, 36, 9682. doi:http://doi.org/10.1007/s11357-                 sonality and frailty: Evidence from four samples. Journal of
   014-9682-8                                                                Research in Personality, 66, 46–53. doi:10.1016/j.jrp.2016.12.006
Hakulinen, C., Elovainio, M., Pulkki-Raback, L., Virtanen, M.,            Stephan, Y., Sutin, A. R., Luchetti, M., & Terracciano, A. (2016).
   Kivimaki, M., & Jokela, M. (2015). Personality and depressive             Allostatic load and personality: A 4-year longitudinal study. Psy-
   symptoms: Individual participant meta-analysis of 10 cohort               chosomatic Medicine, 78, 302–310. doi:10.1097/PSY.0000000
   studies. Depression and Anxiety, 32, 461–470. doi:10.1002/da.             000000281
   22376                                                                  Studenski, S., Perera, S., Patel, K., Rosano, C., Faulkner, K., Inzitari,
Hakulinen, C., Hintsanen, M., Munafo, M. R., Virtanen, M., Kivimäki,        M., . . . Nevitt, M. (2011). Gait speed and survival in older adults.
   M., Batty, G. D., Ip, E. H., Church, T., Marshall, S. A., Zhang, Q.,      Journal of the American Medical Association, 305, 50–58.
   Marsh, A. P., & Guralnik, J., . . . LIFE-P Study Investigators.        Studenski, S., Perera, S., Wallace, D., Chandler, J. M., Duncan, P. W.,
   (2013). Physical activity increases gains in and prevents loss of         Rooney, E., . . . Guralnik, J. M. (2003). Physical performance mea-
   physical function: Results from the lifestyle interventions and           sures in the clinical setting. Journal of the American Geriatrics
   independence for elders pilot study. The Journals of Gerontology          Society, 51, 314–322.
   Series A: Biological Sciences and Medical Sciences, 68,                Suchy, Y., Williams, P. G., Kraybill, M. L., Franchow, E., & Butner, J.
   426–432. doi:10.1093/gerona/gls186                                        (2010). Instrumental activities of daily living among community-
John, O. P., Donahue, E. M., & Kentle, R. L. (1991). The Big Five            dwelling older adults: Personality associations with self-report,
   Inventory—Versions 4a and 54. Berkeley, CA: Institute of                  performance, and awareness of functional difficulties. The
   Personality and Social Research, University of California.                Journals of Gerontology Series B: Psychological Sciences and
Jokela, M. (2015). Personality and smoking: Individual-participant           Social Sciences, 65, 542–550. doi:10.1093/geronb/gbq037
   meta-analysis of nine cohort studies. Addiction, 110, 1844–1852.       Sutin, A. R., Stephan, Y., Luchetti, M., Artese, A., Oshio, A., &
   doi:10.1111/add.13079                                                     Terracciano, A. (2016). The five-factor model of personality and
Jokela, M., Batty, G. D., Nyberg, S. T., Virtanen, M., Nabi, H., Singh-      physical inactivity: A meta-analysis of 16 samples. Journal of
   Manoux, A., & Kivimäki, M. (2013). Personality and all-cause             Research in Personality, 63, 22–28. doi:10.1016/j.jrp.2016.05.001
   mortality: Individual-participant meta-analysis of 3,947 deaths in     Sutin, A. R., Stephan, Y., & Terracciano, A. (in press). Personality and
   76,150 adults. American Journal of Epidemiology, 178, 667–675.            metabolic dysfunction in young adulthood: A cross-sectional
   doi:10.1093/aje/kwt170                                                    study. Journal of Health Psychology. doi:10.1177/13591053
Krueger, K. R., Wilson, R. S., Shah, R. C., Tang, Y., & Bennett, D. A.       16677294
   (2006). Personality and incident disability in older persons. Age      Terracciano, A., Schrack, J. A., Sutin, A. R., Chan, W., Simonsick, E.
   and Ageing, 35, 428–433. doi:10.1093/ageing/afl028                        M., & Ferrucci, L. (2013). Personality, metabolic rate and aerobic
Lachman, M. E., & Weaver, S. L. (1997). The Midlife Development              capacity. PLoS One, 8, e54746. doi:10.1371/journal.pone.0054746
   Inventory (MIDI) Personality Scales: Scale construction and scor-      Terracciano, A., Stephan, Y., Luchetti, M., Gonzalez-Rothi, R., &
   ing. Technical report.                                                    Sutin, A. R. (in press). Personality and lung function in older
780                                                                                             Social Psychological and Personality Science 9(7)
   adults. The Journals of Gerontology Series B: Psychological              Verghese, J., Wang, C., Lipton, R. B., Holtzer, R., & Xue, X. (2007).
   Sciences and Social Sciences. doi:10.1093/geronb/gbv161                    Quantitative gait dysfunction and risk of cognitive decline and
Terracciano, A., Sutin, A. R., An, Y., O’Brien, R. J., Ferrucci, L., Zon-     dementia. Journal of Neurology, Neurosurgery & Psychiatry, 78,
   derman, A. B., & Resnick, S. M. (2014). Personality and risk of            929–935. doi:10.1136/jnnp.2006.106914
   Alzheimer’s disease: New data and meta-analysis. Alzheimer’s &           Weston, S. J., Hill, P. L., & Jackson, J. J. (2015). Personality traits pre-
   Dementia: The Journal of the Alzheimer’s Association, 10,                  dict the onset of disease. Social Psychological and Personality Sci-
   179–186. doi:10.1016/j.jalz.2013.03.002                                    ence, 6, 309–317. doi:10.1177/1948550614553248
Tolea, M. I., Costa, P. T., Terracciano, A., Ferrucci, L., Faulkner, K.,
   Coday, M. M. C., . . . Simonsick, E. M. (2012). Associations             Author Biographies
   of openness and conscientiousness with walking speed decline:
   Findings from the Health, Aging, and Body Composition                    Yannick Stephan is an assistant professor of health and aging psy-
   Study. The Journals of Gerontology. Series B, Psychological              chology at Montpellier University in Montpellier, France. His
   Sciences and Social Sciences, 67, 705–711. doi:10.1093/ger               research focuses on the consequences of personality traits across the
   onb/gbs030                                                               lifespan and on personality development.
Tolea, M. I., Costa, P. T., Terracciano, A., Griswold, M., Simonsick,       Angelina R. Sutin is an assistant professor in the department of beha-
   E. M., Najjar, S. S., . . . Ferrucci, L. (2010). Sex-specific corre-     vioral sciences and social medicine at the College of Medicine of Flor-
   lates of walking speed in a wide age-ranged population. The              ida State University in Tallahassee, USA. Her research addresses how
   Journals of Gerontology Series B: Psychological Sciences and             personality traits are associated with physical and mental health across
   Social Sciences, 65B, 174–184. doi:http://doi.org/10.1093/ger            adulthood.
   onb/gbp130
Tolea, M. I., Terracciano, A., Milaneschi, Y., Metter, E. J., & Ferrucci,   Gabriel Bovier-Lapierre is a currently a graduate student at Mon-
   L. (2012). Personality typology in relation to muscle strength.          tpellier University, in Montpellier, France. His research focuses on the
   International Journal of Behavioral Medicine, 19, 382–390. doi:          consequences of personality for health across the lifespan.
   10.1007/s12529-011-9166-5
                                                                            Antonio Terracciano is an assistant professor in the department of
Verghese, J., Holtzer, R., Oh-Park, M., Derby, C. A., Lipton, R. B., &
                                                                            geriatrics at the College of Medicine of Florida State University in
   Wang, C. (2011). Inflammatory markers and gait speed decline in
                                                                            Tallahassee, USA. His research focuses on the relationships between
   older adults. The Journals of Gerontology Series A: Biological
                                                                            personality traits and physical and mental health across the lifespan.
   Sciences and Medical Sciences, 66A, 1083–1089. doi:10.1093/ger-
   ona/glr099                                                               Handling Editor: Simine Vazire