Functional health status, morbidity and mortality are determined partly by health behaviours (World Health Organization, 2002), which have determinants of their own. Personality traits, such as Conscientiousness, have a strong association with health behaviours (Bogg & Roberts, 2004). There is a less consistent and generally weaker association between traits and health outcomes (e.g. Neuroticism and mortality). The central problem in this thesis is how to measure, model, maximize, and extend trait-health associations. Conceptual issues associated with modelling traits and health are discussed in chapter one. The next three chapters concern such measurement issues about: personality traits (chapter two), health behaviours (chapter three) and health outcomes, with particular reference to functional health status (chapter four). These chapters are followed by a move to modelling (chapter five), with particular reference to the generalized latent variable modelling (LVM) framework (Muth´en & Muth´en, 1998–2007). The HAPPLE study is introduced (chapter six) which is used to model associations between Conscientiousness and health criteria within the LVMframework (chapter seven). Moving beyond self-reported outcomes, which are a mono-method approach, the role of multiple health behaviours in predicting cardiovascular mortality is considered (chapter eight). In a third section, cortisol is introduced, which is a biomarker of stress reactivity. The diurnal profile of cortisol output is described (chapter nine). Latent growth curve modelling is used to illustrate its association with Neuroticism, in a sample of student volunteers (chapter 10). Taken together, the results highlight the need for a general framework of modelling techniques, in personality-health research. I conclude that biopsychosocial models with excellent explanatory power, which are still parsimonious, can be achieved with LVM and its extensions. However, trait researchers will need to state more clearly the intended destinations of their work in order to attract contributions from, and share knowledge with, other disciplines.

In later life, adverse life events, disability, health problems, inadequate social support, and personality traits hypothesized to be important risk factors for depression. Sample included 35 older (65-84) physical rehabilitation patients in a large metropolitan hospital. Statistical analysis included Pearson Product Moment correlations and multiple regression results. Perceived physical health, instrumental ADLs, life satisfaction, extraversion, and conscientiousness are inversely related to depressive symptom severity; neuroticism is positively related to depressive symptom severity. Regression models predicted depressive symptom severity, PANAS negative effect and PANAS positive affect. Neuroticism, insrumental ADLs, and age are significant predictors of depressive symptom severity; neuroticism and age are signficant predictors of PANAS negative affect, while extraversion is a significant predictor of PANAS positive affect. Personality factors, level of functioning, and age are important factors relating to mood. Limitations of this study include: small sample size with special characteristics (high level of SES); incomplete personal and family history of psychiatric problems; and lack of clinical comparison sample.

In this study an attempt was made to gain insight into the meaning of personality traits and how they can be arranged to build an instrument to be used for rating and selecting agents to sell life insurance.

The purpose of this study was to examine the retrospective perceptions of parent-child relations as measured by the Roe-Siegelman Parent-Child Relations Questionnaire (PCR), personality characteristics as they appear on the Minnesota Multiphasic Personality Inventory (MMPI) and types of crimes of prison inmates, specifically divided into aggressive and non-aggressive crimes.

The study was undertaken to discover if the summer camp experience enhanced personality traits of participants in the camp program. The study was implemented at Greene Family Camp in Bruceville, Texas, during the summer of 1985. Utilized were analyses of variance and two types of factor analyses: principal-components analysis with varimax rotation and principal axis factoring with oblique rotation of factor matrices elicited. Five personality areas were analyzed--sociability, independence, achievement, environmental awareness, and spirituality. Spirituality emerged so strongly that it was removed from further analyses. Remaining personality areas emerged, but groupings of variables, especially those relating to achievement and independence, suggest an inherent commonality among the complex facets of personality. Based on these findings, the researcher recommends further investigation and careful replication.

The purpose of this study is to give the results of a testing program in the low seventh grade of an urban school wherein intelligence, personality, achievement, and socioeconomic tests were given. The primary purpose of the tests was to determine what influence, if any, the environmental factors played in the individual learning process, but attention was given to other phases of the learning process as well.

Magister Psychologiae - MPsych / Literature identified Psychology students to be vulnerable to the stress associated with professional postgraduate studies and the nature of multiple processes. Less research has been conducted on Honours students as a cohort. The present study attempted to examine the associations between personality traits, perceived stress and coping styles in a sample of Honours students and post-Honours interns enrolled at a historically disadvantaged university. The present study was a cross-sectional internet survey including four instruments: the Brief COPE questionnaire (coping styles), the Perceived Stress Scale (subjective stress), the Big 5 Personality Survey (BFI-10) (personality traits) and a demographic questionnaire. All participation was voluntary and general principles of ethics were adhered to. The data was analysed using frequencies, correlation matrices, coefficients of determination and and regression. Findings indicated medium levels of perceived stress in this sample including contextual factors like gender, age and race. The B.Psych students reported reduced ranges on perceived stress compared to Honours students. Personality profiles indicated the four highest ranked traits (agreeableness, conscientiousness, openness and extraversion) closely banded. Neuroticism was ranked substantially lower in this sample. More adaptive coping styles like (planning, religion, active coping, acceptance etc.) were used than maladaptive coping styles. Associative relationships were indicated between demographic variables and coping, personality traits and perceived stress respectively. Race, Gender, relationship status, registration status and Age was found to correlate significantly with the three core constructs (perceived stress, coping and personality traits). Findings indicated predictive relationships between combinations of coping styles which could significantly predict perceived stress. Maladaptive coping significantly predicted perceived stress controlling for adaptive coping (e.g. emotion-focused coping and problem-focused coping).

The association between dialect and perceived personality traits has been studied for a number of years. The purpose of this study was to examine how the dialect, the gender of both the speaker and the listener, and the perceived age of the speaker affected the listeners' perception of the speaker's personality. The spontaneous speech samples were drawn from existing corpora. There were 48 speakers, 24 New Zealanders and 24 Utahns. Each dialect group was stratified into three age groups (young, middle, older), and within each age group there were an equal number of males and females. The listener group included 40 adults aged 18-30, 20 females and 20 males. The listeners used a computerized visual analog scale to rate the samples on four personality traits: credibility, confidence, prestige, and pleasantness. They also estimated the age of each speaker. Statistical analysis demonstrated that there were several significant differences in how listeners rated the speakers. Main effects of speaker dialect, speaker age, and speaker and listener gender were observed in age estimation as well as personality perception. The results suggest that listeners' perceptions of personality traits are influenced by the speaker's age, dialect, and gender. Additionally, male and female listeners differed significantly on several measures. The findings of this study demonstrate that speaker dialect and listener gender can influence listener perceptions.

Animals’ personality traits are defined as consistent behavior tendencies and the function of them in life-history strategy and reproductive success has been given a lot of explanations in a large amount of research. However, the behavior consistency of individuals in different sexes, mating status and selection regimes is rarely mentioned. In this research, we were interested in personality traits and their consistency in inter-individuals and intra-individuals, and proposed that with the removal of fecundity selection males would evolve to be more female-like and decrease their locomotor activity, and copulation would change the physiological status of females and thus alter their levels of activity.   In the experiment, seed beetles (Callosobruchus maculatus) that were artificially selected in monogamy, polygamy and male-limited selection regimes were weighed, dropped in a designed arena and their behaviors were recorded with a camera for four minutes in the first day when they were newborn and virgin. In the next day, the virgin beetles were randomly paired to mate, weighed afterwards, and dropped in the arena again for videoing the same setting as yesterday. In data collection step, with these videos four behaviors types including walking, entering squares, time spent on roof and entering a new area were observed, scored and noted down. To process the data, we made correlation analysis and it was found that walking, entering square and a new area were positively correlated. After building the linear mixed effect models we found that sex together with mating significantly act in modifying beetles’ behaviors, males were more active than females but the difference was narrowed after mating, and copulation caused a significant increase in the level of locomotor activity in females. To our disappointment, selection regimes did not have any significant impact on locomotor activity. Our work gave an insight that copulation changed individuals’ behaviors more in females than in males and dimorphic expression of sex-biased genes differed due to mating effect.

A recent meta-analysis by Berry, Ones, and Sackett (2007) revealed that perceptions of organizational justice and employee personality were two significant predictors of counterproductive work behaviors. The facets that make up the organizational justice construct are: procedural justice, distributive justice, interpersonal justice, and informational justice (Berry et al., 2007). Employees perceive justice when organizational justice rules are adhered to. However, when these rules are violated, employees may perceive injustice. The effect of perceived injustice on CWB might depend on individual characteristics, such as personality, particularly Dark Tetrad traits. The Dark Tetrad includes narcissism, Machiavellianism, psychopathy, and sadism (Buckels, Jones, & Paulhus, 2013). The intent of this study was to investigate the relationship between the Dark Tetrad traits and counterproductive work behaviors, as well as examine the moderating influence of perceived organizational injustice (distributive, procedural, interpersonal, informational, and overall injustice) on the relationship between the Dark Tetrad personality traits and four types of CWB; CWB directed towards supervisors, coworkers, the organization itself, and total CWB. Participants completed a two-part online study through Amazon Mechanical Turk, the first of which assessed perceptions of organizational (in)justice (Full-range justice scale; Colquitt, Long, Rodell, & Halvorsen-Ganepola, 2015) as well as levels of Dark Tetrad personality traits (Short Dark Triad Scale SD-3; Jones and Paulhus, 2014, and the Short Sadistic Impulse Scale SSIS; O'Meara, Davies, & Hammond, 2011). The first part of the survey also assessed participants’ negative affectivity (Negative Affectivity subscale of the Positive and Negative Affect Schedule; Watson, Clark, & Tellegen, 1988), and justice sensitivity (Victim Perspective subscale of the Justice Sensitivity Scale; Schmitt, Gollwitzer, & Arbach, 2005). The second survey was distributed 5 days after the first survey and assessed participants’ frequency of engagement in each type of CWB (Workplace Deviance Scale (WDS); Bennett & Robinson, 2000; modified using items from the Supervisor-Directed Deviance Scale; Mitchell & Ambrose, 2007). It was hypothesized that each DT trait would have a significant positive relationship with each type of CWB. This hypothesis was shown to be supported. It was also hypothesized that low levels of perceived organizational justice would moderate the relationships between the DT traits and CWB. This hypothesis was partially supported. Linear regression analyses were conducted, and the results showed that none of the justice facets significantly moderated the relationship of Machiavellianism with any of type of CWB. However, several justice facets showed significant moderating effects between the other three DT traits (narcissism, psychopathy, and sadism) and types of CWB. These results suggest that when individuals perceive a higher level of perceived organizational justice, those with dark tetrad personality traits are more likely to report engaging in fewer counterproductive work behaviors, relative to those who perceive lower levels of perceived organizational justice. The implications are that by improving perceptions of organizational justice, organizations could potentially reduce counterproductive work behavior in employees with strong dark tetrad personality traits.