Genotype accounts for intraspecific variation in the timing and duration of multiple, sequential life-cycle events in a willow species.

PREMISE: Phenological variation among individuals within populations is common and has a variety of ecological and evolutionary consequences, including forming the basis for population-level responses to environmental change. Although the timing of life-cycle events has genetic underpinnings, whether intraspecific variation in the duration of life-cycle events reflects genetic differences among individuals is poorly understood. METHODS: We used a common garden experiment with 10 genotypes of Salix hookeriana (coastal willow) from northern California, United States to investigate the extent to which genetic variation explains intraspecific variation in the timing and duration of multiple, sequential life-cycle events: flowering, leaf budbreak, leaf expansion, fruiting, and fall leaf coloration. We used seven clones of each genotype, for a total of 70 individual trees. RESULTS: Genotype affected each sequential life-cycle event independently and explained on average 62% of the variation in the timing and duration of vegetative and reproductive life-cycle events. All events were significantly heritable. A single genotype tended to be "early" or "late" across life-cycle events, but for event durations, there was no consistent response within genotypes. CONCLUSIONS: This research demonstrates that genetic variation can be a major component underlying intraspecific variation in the timing and duration of life-cycle events. It is often assumed that the environment affects durations, but we show that genetic factors also play a role. Because the timing and duration of events are independent of one another, our results suggest that the effects of environmental change on one event will not necessarily cascade to subsequent events.

Vitamin D deficiency and insufficiency in Hawaii: Levels and sources of serum vitamin D in older adults.

OBJECTIVE: To examine the major sources of vitamin D [25-hydroxyvitamin D (25(OH)D)] and evaluate their collective role on rates of vitamin D deficiency/insufficiency among older adults. METHODS: Cross-sectional analysis of the relationship between serum 25(OH)D levels and sources of vitamin D (self-reported and objectively validated sun exposure, supplementation, food including fortified sources). Study subjects were part of the Hawaii Longitudinal Study of Personality and Health who completed a clinic visit between 55 and 65 years (M = 59.6) and food frequency questionnaire, and provided serum to assay 25(OH)D (n = 223). RESULTS: Although mean serum 25(OH)D levels were overall sufficient (34.3 ng/ml, [SD = 10.9]), over one-third of participants (38%) had vitamin D deficiency/insufficiency (<30 ng/ml). Asians were the most likely to be insufficient and Filipinos were the least likely (43% vs. 11%, respectively). Overall, supplement use and sun exposure were both associated with higher 25(OH)D levels and lower risk of vitamin D deficiency/insufficiency. Moreover, Vitamin D sources varied by race/ethnic groups. In multivariate models, higher body mass index, being Asian or Native Hawaiian/Pacific Islander, low supplement use, and low sun exposure were associated with higher risk for vitamin D deficiency/insufficiency (<30 ng/ml). CONCLUSIONS: Over 1/3 of the older adult sample was vitamin D deficient/insufficient, despite most of the participants living in a tropical climate with year-round access to sun as a vitamin D source. Sun exposure and supplement use, but not food intake, explained differences in vitamin D deficiency/insufficiency in this population.

Associations Between Everyday Discrimination and Sleep: Tests of Moderation by Ethnicity and Sense of Purpose.

BACKGROUND: Everyday discrimination holds pernicious effects across most aspects of health, including a pronounced stress response. However, work is needed on when discrimination predicts sleep outcomes, with respect to potential moderators of these associations. PURPOSE: The current study sought to advance the past literature by examining the associations between everyday discrimination and sleep outcomes in an ethnically diverse sample, allowing tests of moderation by ethnic group. We also examined the role of sense of purpose, a potential resilience factor, as another moderator. METHODS: Participants in the Hawaii Longitudinal Study of Personality and Health (n = 758; 52.8% female; mage: 60 years, sd = 2.03) completed assessments for everyday discrimination, sleep duration, daytime dysfunction due to sleep, sleep quality, and sense of purpose. RESULTS: In the full sample, everyday discrimination was negatively associated with sleep duration, sleep quality, and sense of purpose, while positively associated with daytime dysfunction due to sleep. The associations were similar in magnitude across ethnic groups (Native Hawaiian, White/Caucasian, Japanese/Japanese-American), and were not moderated by sense of purpose, a potential resilience factor. CONCLUSIONS: The ill-effects on health due to everyday discrimination may operate in part on its role in disrupting sleep, an issue that appears to similarly impact several groups. The current research extends these findings to underrepresented groups in the discrimination and sleep literature. Future research is needed to better disentangle the day-to-day associations between sleep and discrimination, and identify which sources of discrimination may be most problematic.

Personality traits predict dietary habits in middle-to-older adults.

Personality traits are consistently associated with health behaviors, but little research has examined the role of personality on eating habits among middle-to-older adults. The current study (n = 665) examined the associations between traits and dietary habits and whether healthy eating predicted health at age 60, with the Hawaii Personality and Health Cohort. Eating healthy foods was associated with higher agreeableness, conscientiousness, emotional stability, and openness, and predicted better self-rated health and lower BMI. Eating unhealthy foods was associated with lower agreeableness, conscientiousness, emotional stability, and openness, and predicted lower self-rated health. Results were not moderated by SES.

No Evidence of "healthy neuroticism" in the Hawaii Personality and Health Cohort.

BACKGROUND: Heterogeneity in the effects of trait neuroticism on mortality has inspired recent theories of "healthy neuroticism," or the possibility that neuroticism can lead people down either healthy or unhealthy behavioral pathways. The logical extension of this theory is that some construct-perhaps another trait, financial resource, or health-relevant situation-changes the relationship between neuroticism and health. The other possibility is that different components of neuroticism lead to different health behaviors and therefore different outcomes. PURPOSE: The current study systematically examines the relationship between child and adult neuroticism and various health indicators including perceptions of health, behaviors, health outcomes, and biomarkers of health. Finally, we examine both potential moderators of the associations with neuroticism and examine its facet structure. METHODS: The current study utilizes data from the Hawaii Longitudinal Study of Personality and Health, which includes both adult (IPIP-NEO) and childhood (teacher-reported) measures of personality and socioeconomic status, as well as a variety of health outcomes, from self-reported health and health behavior to biological markers, such as cholesterol and blood glucose levels. Sample sizes range from 299 to 518. RESULTS: The relationship between neuroticism and health was not consistently moderated by any other variable, nor were facets of neuroticism differentially related to health. CONCLUSIONS: Despite a systematic investigation of the potential "paths" which may differentiate the relationship of neuroticism to health, no evidence of healthy neuroticism was found.

A New Twist on Old Questions: A Life Span Approach to the Trait Concept.

OBJECTIVE: We examine three cardinal concerns in personality psychology from a life span perspective: trait structure, trait stability, and trait mechanisms that account for the predictive utility of traits. We draw on previously published and new findings from the Hawaii Longitudinal Study of Personality and Health, as well as work by others. METHOD: The Hawaii study provides a unique opportunity to relate a comprehensive assessment of participants' childhood personality traits (over 2,000 children, mean age 10 years) to their adult personality traits and other self-report outcomes in their 40s, 50s, and 60s, and their clinically assessed health at mean age 51. RESULTS: Our analyses have demonstrated that the Big Five can be used to describe childhood personality in this cohort. The stability of the Big Five from childhood teacher assessments to adult self- or observer reports is modest and varies from Big Five trait to trait. Personality mechanisms of life span health behavior and life span trauma experience explain some of the influence of childhood Conscientiousness on adult health outcomes. CONCLUSIONS: A life span approach highlights the dynamic nature of traits and their long-term predictive utility, and it offers numerous directions for future research.

A Big Five approach to self-regulation: personality traits and health trajectories in the Hawaii longitudinal study of personality and health.

Self-regulatory processes influencing health outcomes may have their origins in childhood personality traits. The Big Five approach to personality was used here to investigate the associations between childhood traits, trait-related regulatory processes and changes in health across middle age. Participants (N = 1176) were members of the Hawaii longitudinal study of personality and health. Teacher assessments of the participants' traits when they were in elementary school were related to trajectories of self-rated health measured on 6 occasions over 14 years in middle age. Five trajectories of self-rated health were identified by latent class growth analysis: Stable Excellent, Stable Very Good, Good, Decreasing and Poor. Childhood Conscientiousness was the only childhood trait to predict membership in the Decreasing class vs. the combined healthy classes (Stable Excellent, Stable Very Good and Good), even after controlling for adult Conscientiousness and the other adult Big Five traits. The Decreasing class had poorer objectively assessed clinical health measured on one occasion in middle age, was less well-educated, and had a history of more lifespan health-damaging behaviors compared to the combined healthy classes. These findings suggest that higher levels of childhood Conscientiousness (i.e. greater self-discipline and goal-directedness) may prevent subsequent health decline decades later through self-regulatory processes involving the acquisition of lifelong healthful behavior patterns and higher educational attainment.

Personality Change at Mid-Life is Associated with Changes in Self-Rated Health: Evidence from the Hawaii Personality and Health Cohort.

Personality traits change across the lifespan, and trait change, in addition to trait level, may be related to health. Longitudinal data from the Hawaii Personality and Health Cohort were used to investigate associations between changes in traits and self-rated health (SRH). Participants (N = 733, Mage = 44.4) completed measures of the Big Five personality traits and SRH twice approximately 3 years apart. Personality trait changes were associated with SRH change. Additionally, increases on Agreeableness, Conscientiousness, and Openness, and decreases on Neuroticism, predicted increases in SRH, even when controlling for gender and education. Relating correlated trait change at mid-life, when traits reach peak stability, to a consequential health outcome such as SRH change, demonstrates the value of treating both traits and health indicators as dynamic variables.

Longitudinal correlated changes in conscientiousness, preventative health-related behaviors, and self-perceived physical health.

OBJECTIVE: Previous research has found that conscientiousness has positive associations with preventative health-related behaviors and self-perceived health, but little is known about the links between changes in these variables over time. In the present study, we examined how levels and changes in conscientiousness were linked to levels and changes in both preventative health-related behaviors and self-perceived physical health. METHOD: Personality and health questionnaires were administered to participants in two waves, with an interval of approximately three years. Participants ranged in age from 19 to 94. To elucidate the tripartite relations between conscientiousness, preventative health-related behaviors, and self-perceived physical health, we used latent change models to estimate levels and changes of these latent constructs over time. RESULTS: Changes in conscientiousness were significantly and positively correlated with changes in preventative health behaviors and changes in self-perceived physical health. Changes in preventative health behaviors partially mediated the relation between changes in conscientiousness and changes in self-perceived physical health. CONCLUSIONS: This longitudinal study extends previous research on conscientiousness and health by exploring the relations between latent variables over a 3-year period. It provides evidence that increases in conscientiousness and preventative health-related behaviors are associated with improvements in self-perceived health over the same time period.

Associations between Trauma during Adolescence and Sense of Purpose in Middle-to-Late Adulthood.

Early adverse experiences can hold lasting influence on later life outcomes, particularly during formative developmental periods such as adolescence. The current study evaluates the impact of different kinds of adolescent trauma on later sense of purpose in adulthood, using data from the Hawaii Longitudinal Study of Personality and Health. Participants (n = 545) retrospectively reported three kinds of trauma during adolescence: 1) non-betrayal trauma, such as a natural disaster; 2) low betrayal trauma, such as being abused by a stranger; and 3) high betrayal trauma, such as being abused by a relative. At a later assessment, participants (M age = 60.15, SD = 1.96) reported their sense of purpose. Trauma scores were uncorrelated with sense of purpose for the overall sample. However, the associations differed when comparing two of the largest cultural groups in the sample, Japanese-Americans and Native Hawaiians. For participants who identified as Japanese-American, trauma scores held a negative association with later sense of purpose across multiple measures. Results are discussed with respect to how early life experiences differentially impact purpose development across individuals.

How Our Work Influences Who We Are: Testing a Theory of Vocational and Personality Development over Fifty Years.

This study examines the developmental influences of occupational environments on personality traits from childhood to adulthood. We test aspects of a theory of vocational and personality development, proposing that traits develop in response to work experience following corresponsive and noncorresponsive mechanisms. We describe these pathways in the context of situations of vocational gravitation and inhabitation. In a sample from the Hawaii personality and health cohort (N = 596), we examined associations of childhood and adulthood personality traits, with occupational environments profiled on the RIASEC model. Mediations tests confirmed that work influenced personality development from childhood to adulthood for Openness/Intellect. We observed multiple reactivity effects of occupation environments on adulthood traits that were not associated with corresponding selection effects.

Compensatory conscientiousness and health in older couples.

The present study tested the effect of conscientiousness and neuroticism on health and physical limitations in a representative sample of older couples (N= 2,203) drawn from the Health and Retirement Study. As in past research, conscientiousness predicted better health and physical functioning, whereas neuroticism predicted worse health and physical functioning. Unique to this study was the finding that conscientiousness demonstrated a compensatory effect, such that husbands' conscientiousness predicted wives' health outcomes above and beyond wives' own personality. The same pattern held true for wives' conscientiousness as a predictor of husbands' health outcomes. Furthermore, conscientiousness and neuroticism acted synergistically, such that people who scored high for both traits were healthier than others. Finally, we found that the combination of high conscientiousness and high neuroticism was also compensatory, such that the wives of men with this combination of personality traits reported better health than other women.

Not all conscientiousness scales change alike: a multimethod, multisample study of age differences in the facets of conscientiousness.

Previous research has shown that traits from the domain of conscientiousness tend to increase with age. However, previous research has not tested whether all aspects of conscientiousness change with age. The present research tests age differences in multiple facets of conscientiousness (industriousness, orderliness, impulse control, reliability, and conventionality) using multiple methods and multiple samples. In a community sample (N = 274) and a representative statewide sample (N = 613) of 18- to 94-year-olds, self-reported industriousness, impulse control, and reliability showed age differences from early adulthood to middle age, whereas orderliness did not. The transition into late adulthood was characterized by increases in impulse control, reliability, and conventionality. In contrast, age differences in observer-rated personality occurred mainly in older adulthood. Age differences held across both ethnicity and levels of socioeconomic status.

Pathways Linking Childhood Personality to Later Life Outcomes.

Dispositional characteristics are associated with important life outcomes across the lifespan, often predicting outcomes decades in advance. Evidence has accrued to demonstrate that personality characteristics measured during childhood and adolescence show unique effects on later life outcomes above and beyond adult personality. Currently it is unclear why personality produces unique effects at different life stages, given the modest consistency of personality across the lifespan. The current article sets forth potential explanations for why these unique predictive effects may occur, charting multiple pathways that link childhood personality to later outcomes that differ from how adult personality influences the same products. We conclude by providing directions for future longitudinal investigations into when, why, and how assessments of childhood personality can help advance our understanding of lifespan development.

The Health Behavior Checklist: Factor structure in community samples and validity of a revised good health practices scale.

This study examined the factor structure and predictive validity of the commonly used multidimensional Health Behavior Checklist. A three-factor structure was found in two community samples that included men and women. The new 16-item Good Health Practices scale and the original Wellness Maintenance scale were the only Health Behavior Checklist scales to be related to cardiovascular and metabolic risk factors. While the other Health Behavior Checklist scales require further validation, the Good Health Practices scale could be used where more objective or longer measures are not feasible.

A purposeful lifestyle is a healthful lifestyle: Linking sense of purpose to self-rated health through multiple health behaviors.

Having a purpose in life has been consistently linked to subjective and objective health markers. Using data from the Hawaii Study of Personality and Health (n = 749, Mage = 60.1 years), we tested multiple health behaviors as unique mediators of the correlation between sense of purpose and self-rated health (r = .29). Correlational analyses found that participants' sense of purpose was positively associated with their reports of vigorous and moderate activity, vegetable intake, flossing, and sleep quality. Combined in a multiple-mediator model, bootstrapping analyses suggested that sleep quality and vigorous activity proved significant unique mediators.

From Elementary School to Midlife: Childhood Personality Predicts Behavior During Cognitive Testing over Four Decades Later.

The current study uses a prospective, longitudinal design and lifespan perspective to understand how child personality relates to directly observed adult behavior during cognitive testing. Teacher assessments of child Big Five personality in elementary school were correlated with directly observed behaviors during a videotaped cognitive test four decades later. Past work suggested Openness and Conscientiousness may relate to task-relevant academic behaviors. Childhood Openness was associated with several behaviors, even after controlling for participant's cognitive performance. Childhood Conscientiousness was also related to behavior, but not as expected. Other Big Five ratings were not reliably related to behavior. The study examined personality stability in a unique way and suggests a further examination of how Openness in children manifests in later behavior.

Purpose in Life in Emerging Adulthood: Development and Validation of a New Brief Measure.

Accruing evidence points to the value of studying purpose in life across adolescence and emerging adulthood. Research though is needed to understand the unique role of purpose in life in predicting well-being and developmentally relevant outcomes during emerging adulthood. The current studies (total n = 669) found support for the development of a new brief measure of purpose in life using data from American and Canadian samples, while demonstrating evidence for two important findings. First, purpose in life predicted well-being during emerging adulthood, even when controlling for the Big Five personality traits. Second, purpose in life was positively associated with self-image and negatively associated with delinquency, again controlling for personality traits. Findings are discussed with respect to how studying purpose in life can help understand which individuals are more likely to experience positive transitions into adulthood.

Childhood Personality, Betrayal Trauma, and Leukocyte Telomere Length in Adulthood: A Lifespan Perspective on Conscientiousness and Betrayal Traumas as Predictors of a Biomarker of Cellular Aging.

Conscientiousness is associated with longevity. As such, identifying the biological pathways linking personality to mortality is important. This study employs longitudinal data spanning >40 years to test prospective associations with Leukocyte Telomere Length (LTL), a potential marker of cellular aging. Because telomeres shorten over time, and are sensitive to oxidative stress, shorter LTL may reflect cumulative damage associated with negative health behaviors and past stressful events. We investigated childhood conscientiousness as a protective factor, expecting an association with longer LTL in adulthood, possibly reflecting slower LTL shortening. Potential lifespan pathways involving childhood trauma, smoking behaviors, and Body Mass Index (BMI) were explored. Childhood conscientiousness showed a small raw association with LTL (r = .08, p = .04), although this effect did not persist when controlling for age and sex. Despite this lack of a direct effect on LTL, we detected an indirect effect operating jointly through BMI and smoking. Higher rates of childhood betrayal trauma were associated with shorter LTL. Contrary to our hypothesis that conscientiousness would buffer this effect, we found evidence for an interaction with childhood betrayal traumas where the association between childhood betrayal traumas and LTL was larger for those higher on conscientiousness in childhood.

Lifetime trauma, personality traits, and health: A pathway to midlife health status.

OBJECTIVE: This study investigated whether lifetime experience of trauma is related to personality through instrumental and reactive trait processes, and whether lifetime trauma is a mechanism underlying the association between childhood conscientiousness and objectively assessed adult physical health. METHOD: Participants (N = 831) were 442 women and 389 men from the Hawaii longitudinal study of personality and health. Teacher assessments of personality were obtained when the participants were in elementary school. Self-reported adult personality assessments, lifetime histories of trauma experience, and objectively assessed physiological dysregulation were obtained between ages 45-55. RESULTS: Women tended to report more high-betrayal trauma than men, whereas men reported more low-betrayal trauma than women. Women who were judged by their teachers to be less agreeable and less conscientious in childhood reported more lifetime trauma, suggesting instrumental trait processes. For both genders, neuroticism and openness/intellect/imagination in adulthood, but not in childhood, were associated with lifetime trauma, suggesting reactive trait processes. For both genders, trauma experience was correlated with dysregulation and with Body Mass Index (BMI). The indirect paths from childhood conscientiousness to adult dysregulation and BMI through total teen and adult trauma were significant for women, but not for men (indirect effect for women's dysregulation = -.025, p = .040, 95% confidence interval [CI] = -.048, -.001; indirect effect for women's BMI = -.037, p = .009, 95% CI = -.067, -.008). CONCLUSION: Teen and adult trauma experience appears to be a hitherto unidentified mechanism in women underlying the association between conscientiousness and health. (PsycINFO Database Record