Understanding the association between socioeconomic status and physical health: do negative emotions play a role?

The role of social support and integration for understanding socioeconomic disparities in self-rated health and hypertension

This paper examines socioeconomic (socioeconomic status, SES) disparities in self-rated health and hypertension among 29,816 US adults aged 25 and older using data from the 2001 wave of the National Health Interview Survey. Our purpose is to examine how influential measures of social support and social integration are for each health outcome, and whether support and integration operate by mediating, or buffering, the effects of SES on health. Multivariate regression models show no significant influence of emotional support, but do indicate that many aspects of social integration are directly associated with self-rated health and hypertension, although these measures do not mediate the relationship between SES and health. However, interaction tests show substantial evidence that measures of social integration buffer some of the negative effects of low SES, particularly the negative influence of not working on self-rated health. In addition, findings indicate potential evidence of help-seeking behavior among adults who did not finish high school or who report financial barriers to medical care. Overall, our findings suggest that social programs designed to foster social integration (e.g., free or low-cost bus fare to promote visits with friends and family) may improve health among persons with low levels of education, who are not working, or who have problems accessing medical care because of financial problems.

Impact of socioeconomic status on physiological health in adolescents: an experimental manipulation of psychosocial factors

OBJECTIVE

To examine the effects of a brief psychosocial manipulation on physiological responses to laboratory stress in lower and higher socioeconomic status (SES) adolescents.

METHODS

A total of 115 adolescents participated in two acute laboratory stress tasks: one with psychosocial intervention and one with no intervention. In the intervention condition, half of the adolescents were given control over the stressor parameters; the other half received social informational resources (hints provided by another person) for dealing with the stressor. Physiological reactivity was monitored.

RESULTS

Lower SES adolescents exhibited less physiological reactivity when provided with intervention compared with no intervention. Within the lower SES group, the resource condition reduced physiological reactivity more than the control condition did. Higher SES adolescents did not respond physiologically to intervention.

CONCLUSIONS

This study provides a preliminary illustration of an experimental laboratory approach to studying SES-health relationships and suggests that providing informational support during a stressor may have beneficial implications for the physiological health of lower SES adolescents.

Life-course approaches to inequalities in adult chronic disease risk

A life-course approach to chronic-disease epidemiology uses a multidisciplinary framework to understand the importance of time and timing in associations between exposures and outcomes at the individual and population levels. Such an approach to chronic diseases is enriched by specification of the particular manner in which timing in relation to physical growth, reproduction, infection, social mobility, behavioural transitions etc. can influence various adult chronic diseases in different ways, and more ambitiously by how these temporal processes are interconnected and manifested in health inequalities within a population and in population-level disease trends. The paper will discuss some historical background to life-course epidemiology and theoretical models of life-course processes, and will review some of the empirical evidence linking life-course processes to CHD, haemorrhagic stroke, stomach cancer and other chronic diseases in adulthood. It will also underscore that a life-course approach offers a way to conceptualize how underlying socio-environmental determinants of health, experienced at different life-course stages, can differentially influence the development of chronic diseases, as mediated through proximal specific biological processes.

Effects of socioeconomic status on breastfeeding duration in mothers of preterm and term infants

BACKGROUND

The propensity to breastfeed is not only of importance with regard to the beneficial effects on the individual, but is also of concern as an indicator of health behaviour related to social conditions. Thus, our aim was to investigate the impact of socioeconomic status (SES) on breastfeeding duration in mothers of preterm and term infants.

METHODS

Prospective population based cohort study. Data for infants registered in breastfeeding databases of two Swedish counties 1993-2001 were matched with data from two national registries-the Medical Birth Registry and Statistics Sweden. A total of 37,343 mothers of 2093 preterm and 35,250 term infants participated.

RESULTS

All socioeconomic factors; maternal educational level, maternal unemployment benefit, social welfare and equivalent disposable income, were strongly associated with breastfeeding when examined individually in mothers of preterm and term infants. Some of the associations attenuated when investigated simultaneously. Independently of SES and confounders, mothers of preterm infants were at higher risk of weaning before the infant was 2 months (adjusted odds ratio (OR) 1.70; 95% confidence interval ((CI) 1.46-1.99)), 4 months (OR 1.79; CI 1.60-2.01), 6 months (OR 1.48; CI 1.33-1.64), and 9 months old (OR 1.19; CI 1.06-1.34), compared with mothers of term infants.

CONCLUSIONS

In Sweden, despite its social welfare support system and a positive breastfeeding tradition, SES clearly has an impact on the breastfeeding duration. Mothers of preterm infants breastfeed for a shorter time compared with mothers of term infants, even when adjustments are made for SES and confounders.

Five-Factor Personality Dimensions, Mood States, and Cognitive Performance in Older Adults

In this study we examined the impact of personality traits and negative mood state on performance in several cognitive domains in a sample of 398 elderly community-dwelling individuals. Multiple linear regression analyses were used to examine the variance in cognitive measures explained by state depression and anxiety after controlling for the effects of demographic characteristics and five-factor model personality traits. Personality traits were found to contribute significantly to cognitive function, explaining 2-7% of the variance in ability across domains. Examination of the contributions of individual five-factor traits showed that Openness had a significant relationship with all indexes of verbal memory and with general cognitive ability. State anxiety and depression variables were found to play a very small part, however, in contributing to cognitive function.

Associations between depressive symptoms and inflammatory/hemostatic markers in women during the menopausal transition

OBJECTIVE

To test whether depressive symptoms are related to inflammatory and hemostatic markers in women approaching menopause.

METHODS

A total of 3292 women enrolled in the Study of Women's Health Across the Nation (SWAN) were followed for five years and had measures of Center for Epidemiologic Studies-Depression and high sensitivity C-reactive protein, Factor VIIc, fibrinogen, plasminogen activator inhibitor Type 1(PAI-1), and tissue-type plasminogen activator antigen (tPA-ag) up to four times during the follow-up period. Women were pre- or early perimenopausal status at study entry and were of Caucasian, African American, Hispanic, Japanese, or Chinese race/ethnicity.

RESULTS

Unadjusted longitudinal mixed regression models showed that over a 5-year period, higher depressive symptoms were related to higher fibrinogen, PAI-1, and tPA-ag levels, all p < .0001. Taking into account health history, medication use, ethnicity, aging, and menopausal status, the depressive symptoms were related to fibrinogen, p < .01, and PAI-1, p < .05. Depressive symptoms were related only to fibrinogen in models that also included body mass index, p < .05.

CONCLUSIONS

Depressive symptoms may be associated with cardiovascular risk in perimenopausal women in part through hypercoagulability. This is the first study to test the association of depressive symptoms and hemostatic and inflammatory markers across time.

Socioeconomic differences in adolescent stress: the role of psychological resources

PURPOSE

To investigate whether psychological resources influenced the association between parent education (PE), a marker of socioeconomic status (SES), and perceived stress.

METHODS

Cross-sectional analyses were conducted in a sample of 1167 non-Hispanic black and white junior and senior high school students from a Midwestern public school district in 2002-2003. Hierarchical multivariable regression analyses examined relationships between PE (high school graduate or less = E1, > high school, < college = E2, college graduate = E3, and professional degree = E4), and psychological resources (optimism and coping style) on teens' perceived stress. Greater optimism and adaptive coping were hypothesized to influence (i.e., mediate or moderate) the relationship between higher PE and lower stress.

RESULTS

Relative to adolescents from families with a professionally educated parent, adolescents with lower parent education had higher perceived stress (E3 beta = 1.70, p < .01, E2 beta = 1.94, p < .01, E1 beta = 3.19, p < .0001). Both psychological resources were associated with stress: higher optimism (beta = -.58, p < .0001) and engagement coping (beta = -.19, p < .0001) were associated with less stress and higher disengagement coping was associated with more stress (beta = .09, p < .01). Adding optimism to the regression model attenuated the effect of SES by nearly 30%, suggesting that optimism partially mediates the inverse SES-stress relationship. Mediation was confirmed using a Sobel test (p < .01).

CONCLUSIONS

Adolescents from families with lower parent education are less optimistic than teens from more educated families. This pessimism may be a mechanism through which lower SES increases stress in adolescence.

The experience of emotion

Experiences of emotion are content-rich events that emerge at the level of psychological description, but must be causally constituted by neurobiological processes. This chapter outlines an emerging scientific agenda for understanding what these experiences feel like and how they arise. We review the available answers to what is felt (i.e., the content that makes up an experience of emotion) and how neurobiological processes instantiate these properties of experience. These answers are then integrated into a broad framework that describes, in psychological terms, how the experience of emotion emerges from more basic processes. We then discuss the role of such experiences in the economy of the mind and behavior.

Socioeconomic disparities in insulin resistance: results from the Princeton School District Study

OBJECTIVES

The objectives of this study were to determine whether lower socioeconomic status (SES) is associated with changes in insulin resistance in adolescents over a 3-year period and explore moderators of this effect.

METHODS

A total of 1167 healthy non-Hispanic black and white participants in the Princeton School District Study, a longitudinal study of fifth to 12th graders in a suburban Midwestern public school district were included in this study. Inclusion criteria were a) physical examination and fasting morning blood draw at baseline and 3 years later, b) younger than 20 years old at follow up, and c) information available on SES provided by a parent. The influence of SES on insulin resistance and change in insulin resistance over time was examined using general linear models adjusting for multiple covariates. Models also assessed if race or baseline weight status changed the SES-insulin resistance relationship and explored the role of perceived stress.

RESULTS

Blacks and lower SES youth had higher body mass index z score and increased insulin resistance (p < .001). In multivariable models, lower parent education, but not household income, was associated with higher baseline insulin resistance (F = 7.84, p < .001) and worsening insulin resistance over time (F = 18.86, p < .001). Parent education's effect on change in insulin resistance was more pronounced for obese youth compared with nonobese (F interaction = 10.12, p < .001) even with adjustment for multiple covariates. Perceived stress did not alter these relationships.

CONCLUSIONS

Lower parent education appears to be related to increased insulin resistance both cross-sectionally and over time in black and white adolescents. Worsening insulin resistance is especially problematic for obese adolescents from families with low parent education.

A quantitative analysis of the relationship between the Cook-Medley Hostility Scale and traditional coronary artery disease risk factors

One possible explanation for the association between Cook-Medley Hostility Scale (Ho Scale; W. W. Cook & D. M. Medley, 1954) scores and premature coronary artery disease (CAD) morbidity and mortality is that hostile persons also have elevations on CAD risk factors. Meta-analyses with fixed and random-effects models were used to evaluate the relationship between Ho Scale scores and CAD risk factors in the empirical literature. Ho Scale scores were significantly related to body mass index, waist-to-hip ratio, insulin resistance, lipid ratio, triglycerides, glucose, socioeconomic status (SES), alcohol consumption, and smoking. Although there was also heterogeneity among study outcomes, the results of conservative random effects models provide confidence in the obtained relationships. On the basis of available evidence, researchers might give attention to obesity, insulin resistance, damaging health behaviors, and SES as potential contributing factors in understanding the association between Ho Scale scores and CAD.

Repressing distress in childhood: a defense against health-related stress

This paper is a review of empirical investigations of the repressive adaptive style in youth. Studies were selected on the basis of their adherence to Weinberger et al.'s (J Abnorm Psychol 88: 369-380, 1979) paradigm, consisting of the interaction between a measure of distress and a measure of defensiveness to categorize repressors. The presence of a repressive style of adaptation was identified in adolescence, especially among pediatric populations. Adolescent repressors were found to exhibit characteristics similar to those identified among adult samples (i.e., self-deception, biased self-reports, and inhibition of signals of distress). Only one study focused on young repressors' autonomic reactivity, which is another main characteristic of a repressive adaptive style in adulthood. Methodological inconsistencies between child studies are highlighted and weaknesses in the psychometric properties of defensiveness measures in childhood are discussed. Future investigations should examine the impact of a repressive adaptive style on health outcomes and behaviors to see if adult health data associated with a repressive style of adaptation are replicable in childhood.

Childhood socioeconomic status and suicide mortality in early adulthood among Norwegian men and women. A prospective study of Norwegians born between 1955 and 1965 followed for suicide from 1990 to 2001

Even though the causes of suicide may be rooted in childhood, it is unknown how socioeconomic position (SEP) in childhood is related to suicide in adulthood. We describe the association between childhood SEP and suicide mortality in adulthood in Norway using registry data on 613807 Norwegians born in 1955-1965. Data on 1013 suicide deaths between 1990 and 2001 were linked to data on SEP indicators, using Cox regression. Suicide mortality was higher among women with high childhood SEP than among women with low childhood SEP. This association was explained in part by family situation in adulthood, but not by adult SEP. For males, after adjustment for adult SEP, we observed a similar but weaker association between suicide and childhood SEP. We discuss several mechanisms which may explain the direct positive association of childhood SEP with suicide mortality in adulthood, especially among females. These are downward mobility, not meeting high demands set by highly educated parents, psychological distress, mental disorder, gender differences and social networks and norms.

Perceived Ethnic Discrimination in Relation to Daily Moods and Negative Social Interactions

Ethnic discrimination experienced in an interpersonal context has been identified as a stressor contributing to racial disparities in health. Exposure to racism may influence the way people view their ongoing experiences, making it more likely that individuals will appraise new situations as threatening and harmful, adding to their overall stress burden. A multiethnic sample of 113 adults completed a diary page every 30 min for one day. The diary inquired about moods and perceptions of social interactions. When controlling for personality characteristics, mixed models regression analyses indicated that baseline measures of ethnic discrimination (assessed with the Perceived Ethnic Discrimination Scale-Community Version) were positively associated with daily levels of anger and the intensity of participants' rating of routine social interactions as harassing, exclusionary, and unfair. These findings have implications for models of the contribution of psychosocial factors to racial disparities in health.

Psychological factors as mechanisms for socioeconomic disparities in health: a critical appraisal of four common factors

Social epidemiology has increasingly looked to psychological factors as both risk factors for physical health and mechanisms behind disparities. Yet, there has been little resolution to the question of whether psychological factors explain disparities, and skepticism has begun to mount about whether psychological factors are causally linked to health. Furthermore, some have questioned the nature of the relationship: most research suggests that psychological factors mediate the relationship between socioeconomic status and health, but recent research suggests that they moderate the relationship. The present paper attempts to provide a more comprehensive appraisal of the current debate. It uses four popular psychological factors (i.e., self-esteem, mastery, neuroticism, and depressive symptoms), three health outcomes, and a nationally representative, three-panel longitudinal survey. The results illustrate the promise and limitations of psychological mechanisms. In the cross-section, the results provide evidence for substantial moderating effects, but these effects disappear entirely when estimated prospectively. The results also provide some evidence for mediating effects, but these effects are very weak and the prospective effects of psychological factors diminish over time and with controls for baseline health. Implications for theories of socioeconomic status and health are discussed and a more social psychologically sophisticated approach is encouraged.

Objective and perceived neighborhood environment, individual SES and psychosocial factors, and self-rated health: An analysis of older adults in Cook County, Illinois

This article investigates the relationship among objectively assessed neighborhood socio-economic status (SES), subjective perceptions of neighborhood environment, individual SES and psychosocial factors, and self-rated health among middle-aged and older adults. Analysis of data from a representative sample of adults, aged 50-67 years in Cook County, Illinois, shows a significant association between objective neighborhood SES and self-rated health after controlling for age, gender, and race/ethnicity, but the effect is substantially explained by individual SES and neighborhood perceptions. By contrast, perceived neighborhood quality (i.e., subjective ratings of neighborhood physical, social, and service environments) exhibits a significant effect after controlling for individual socio-demographic factors as well as neighborhood SES. In turn, the effects of perceived neighborhood environment on health are partially explained by the psychosocial factors of loneliness, depression, hostility, and stress, but not by perceived social support or social networks. In sum, the research supports a model in which the effects of neighborhood SES on self-rated health act through sequential pathways of individual SES, perceptions of neighborhood quality, and psychosocial status.

Relationship of early life stress and psychological functioning to adult C-reactive protein in the coronary artery risk development in young adults study

BACKGROUND

Low socioeconomic status (SES) and a harsh family environment in childhood have been linked to mental and physical health disorders in adulthood. The objective of the present investigation was to evaluate a developmental model of pathways that may help explain these links and to relate them to C-reactive protein (CRP) in the Coronary Artery Risk Development in Young Adults (CARDIA) dataset.

METHODS

Participants (n = 3248) in the CARDIA study, age 32 to 47 years, completed measures of childhood SES (CSES), early family environment (risky families [RF]), adult psychosocial functioning (PsyF, a latent factor measured by depression, mastery, and positive and negative social contacts), body mass index (BMI), and C-reactive protein.

RESULTS

Structural equation modeling indicated that CSES and RF are associated with C-reactive protein via their association with PsyF (standardized path coefficients: CSES to RF, RF to PsyF, PsyF to CRP, CSES to CRP, all p < .05), with good overall model fit. The association between PsyF and CRP was partially mediated by BMI (PsyF to BMI, BMI to CRP, both p < .05).

CONCLUSIONS

Low childhood SES and a harsh early family environment appear to be related to elevated C-reactive protein in adulthood through pathways involving psychosocial dysfunction and high body mass index.

Mastery, perceived stress and health-related behaviour in northeast Arnhem Land: a cross-sectional study

BACKGROUND

Indigenous peoples in Australia are disadvantaged on all markers of health and social status across the life course. Psychosocial factors are implicated in the aetiology of chronic diseases and in pathways underpinning social health disparities. Minimal research has investigated psychosocial factors and health in Indigenous peoples. This study evaluated associations between mastery, perceived stress, and health-related behaviour for a remote Indigenous population in Australia.

METHODS

Complete data on mastery (the degree to which individuals feel in control of their lives), perceived stress, physical activity, and fruit and vegetable consumption were obtained for 177 participants in a community-based chronic disease risk factor survey. Psychosocial questionnaires were completed as an option during community screening (response rate = 61.9%). Extensive consultation facilitated the cross-cultural adaptation of measures.

RESULTS

Mastery was inversely correlated with perceived stress measures (p < 0.009): recent stress, r = -0.47; chronic stress, r = -0.41; and youth stress, r = -0.30. Relationships between mastery and behaviour varied according to age group (<25 or > or =25 years) for physical activity (p = 0.001) and vegetable consumption (p = 0.005). Individuals aged > or =25 years engaging in < or =2 bouts of physical activity/week had lower mastery than individuals engaging in > or =3 bouts/week, with means (95% CI) of 14.8 (13.7-15.8) and 17.1 (15.3-19.0), respectively (p = 0.026). Individuals aged > or =25 years eating vegetables < or =3 times/week had lower mastery than those eating vegetables > or =4 times/week (p = 0.009) [means 14.7 (13.8-15.5) and 17.3 (15.5-19.1), respectively]. Individuals <25 years engaging in < or =2 bouts of physical activity/week had greater mastery than individuals engaging in > or =3 bouts/week (p = 0.022) [means 17.2 (15.2-19.2) and 13.8 (11.9-15.7), respectively]. For men > or =25 years and women > or =15 years, mastery was inversely related to age (p < 0.002). Men <25 years had less mastery than women of equivalent age (p = 0.001) [means 13.4 (12.1-14.7) and 17.5 (15.3-19.8), respectively].

CONCLUSION

Consistent with previous research, this study provides additional support for a link between mastery and health-related behaviour, and extends evidence of this association to a remote Indigenous population. Mastery's association with perceived stress, its age-specific association with health behaviour, and findings of low mastery amongst young men, highlights a need for life course research accounting for contextual factors affecting Indigenous peoples.

Daily interpersonal events in pain patients: applying action theory to chronic illness

Action theory proposes that individuals actively shape and then respond to their environments, highlighting the role of stable person characteristics in the development and maintenance of life's interpersonal difficulties. In this study, the authors adopt the action perspective in their examination of predictors of daily interpersonal events among chronic pain patients with rheumatoid arthritis. They probe the extent to which stable symptoms of illness explained between-person variation, and fluctuating symptoms explain day-to-day variation in both positive and negative events. Their evaluation of patients' daily diary reports indicate that between-person differences accounted for more variance in the occurrence of positive events relative to negative events (48% vs. 31%, respectively). Likewise, between-person factors accounted for more variance in appraisals of positive compared to negative events across relationship domains. Both intractable illness symptoms and disability, and daily fluctuations in pain and fatigue, were only weakly related to patients' reports of their interpersonal experiences. Consistent with action theory, these results suggest that stable person characteristics are strongly related to daily stressors and particularly daily positive events in pain patients, but still account for less than 50% of the variance in events and their appraisals. In contrast, elevations in illness-related features, both between individuals and within individuals from day-to-day, are not robust predictors of positive or negative social exchanges. These findings point to the value of capturing the experiences of individuals intensively over time, an approach that can help to elaborate the contributions of both stable factors and circumstance in shaping social contexts in chronic illness.

Catastrophizing, Pain, and Social Adjustment in Scleroderma: Relationships With Educational Level

OBJECTIVES

Low educational attainment is related to numerous adverse health outcomes, and some evidence suggests that psychosocial variables may mediate education's effects. Moreover, the relationship between psychosocial functioning and health-related outcomes may be moderated by educational level, with individuals lower in formal education being more susceptible to the deleterious effects of negative cognitive and affective states. The present study sought to characterize such interrelationships between educational level and pain-related catastrophizing.

METHODS

We investigated the association of self-reported educational level with pain and social disability, we evaluated catastrophizing's potential mediating role in those associations, and we also investigated education as a moderator of catastrophizing's effects on pain and social disability in a sample of patients with scleroderma, a frequently painful autoimmune disorder.

RESULTS

First, education-related differences in pain report were accounted for by catastrophizing and depression. Second, after controlling for demographic factors, disease severity, and depressive symptoms, education moderated the relationship between catastrophizing, pain affect, and social function. Specifically, catastrophizing was more highly associated with greater reporting of affective pain among those with less formal education. In addition, catastrophizing inversely correlated with social disruption among individuals with less formal education.

DISCUSSION

Collectively, study findings support multiple models of interaction between education and pain-related cognitive/affective functioning, though in both mediational and moderational analyses, lower levels of formal education act as a risk factor for adverse pain-related outcomes.

Health psychology: psychological adjustment to chronic disease

Chronic diseases carry important psychological and social consequences that demand significant psychological adjustment. The literature is providing increasingly nuanced conceptualizations of adjustment, demonstrating that the experience of chronic disease necessitates adaptation in multiple life domains. Heterogeneity in adjustment is apparent between individuals and across the course of the disease trajectory. Focusing on cancer, cardiovascular disease, and rheumatic diseases, we review longitudinal investigations of distal (socioeconomic variables, culture/ethnicity, and gender-related processes) and proximal (interpersonal relationships, personality attributes, cognitive appraisals, and coping processes) risk and protective factors for adjustment across time. We observe that the past decade has seen a surge in research that is longitudinal in design, involves adequately characterized samples of sufficient size, and includes statistical control for initial values on dependent variables. A progressively convincing characterization of risk and protective factors for favorable adjustment to chronic illness has emerged. We identify critical issues for future research.

Socioeconomic status, psychosocial processes, and perceived health: an interpersonal perspective

BACKGROUND

Psychosocial variables, including stress, emotions, and social factors, may contribute to the association between socioeconomic status (SES) and health. Concepts and methods from interpersonal theory (1) could provide a useful framework for research concerning the roles of psychosocial factors in socioeconomic health disparities.

PURPOSE

We examined the association between SES and psychosocial processes captured by the interpersonal circumplex and tested the degree to which circumplex ratings explained the association between SES and perceived health.

METHODS

San Diego community residents (N = 304; 51% male; 34% Latino; 50% White; 20% Black; 6.8% Asian/Asian American; 2.9% another ethnicity) completed a circumplex-based assessment of several social contexts (home, work, and community), the SF-12 measure of perceived health, and questions concerning demographic characteristics.

RESULTS

Multilevel models revealed that individuals with lower SES described their social worlds as more hostile and less friendly compared with their higher SES counterparts. Furthermore, lower SES was associated with perceptions of exposure to more dominant or controlling behavior from others, compared with higher SES. Appraisals of hostility versus friendliness, in particular, helped explain the inverse association between SES and some aspects of perceived health.

CONCLUSIONS

Applications of interpersonal theory may be useful in efforts to understand the roles of psychosocial factors in SES-related health disparities.

Socioeconomic Status in Childhood and Adulthood: Associations With Dispositional Optimism and Pessimism Over a 21-Year Follow-Up

We examined whether dispositional optimism and pessimism (overall LOT-R and optimism and pessimism component scores) of 694 adults aged 24 and 27 were associated with socioeconomic status (SES) measured concurrently and in childhood at ages 3 and 6. SES measures included education, occupational status and unemployment, and income. Concurrent adulthood SES was associated with the overall LOT-R and optimism and the pessimism component scores. Childhood family SES predicted overall LOT-R and pessimism component scores, even after controlling statistically for the adulthood SES. Social mobility between SES of family of origin and current SES also influenced the scores. The current findings suggest that the foundation of dispositional optimism and pessimism is related to early SES of the family.

Burnout and risk of cardiovascular disease: evidence, possible causal paths, and promising research directions

Burnout is characterized by emotional exhaustion, physical fatigue, and cognitive weariness, resulting from prolonged exposure to work-related stress. The authors review the accumulated evidence suggesting that burnout and the related concept of vital exhaustion are associated with increased risk of cardiovascular disease and cardiovascular-related events. The authors present evidence supporting several potential mechanisms linking burnout with ill health, including the metabolic syndrome, dysregulation of the hypothalamic-pituitary-adrenal axis along with sympathetic nervous system activation, sleep disturbances, systemic inflammation, impaired immunity functions, blood coagulation and fibrinolysis, and poor health behaviors. The association of burnout and vital exhaustion with these disease mediators suggests that their impact on health may be more extensive than currently indicated.

Personality and incident disability in older persons

OBJECTIVE

to examine the relation of personality to the development of disability in old age.

METHODS

participants are 813 older Catholic nuns, priests and brothers without dementia or disability at study onset. As part of a uniform baseline evaluation, they completed standard measures of the five principal dimensions of personality. Disability was assessed at baseline and annually thereafter with the Katz scale. The relation of each trait to incident disability was assessed in proportional hazard models controlled for age, sex, education and selected clinical variables.

RESULTS

during a mean of about 6 years of observation, 255 persons (31%) became dependent on at least one activity of daily living. Risk of becoming disabled was 85% [95% confidence interval (CI) = 80.5-89.6%] lower in persons with high (90th percentile) compared to low (10th percentile) extraversion and 50% (95% CI = 46.6-54.2%) lower in those with high compared to low conscientiousness, and controlling for chronic medical conditions, depressive symptoms or social and cognitive activity did not substantially affect these associations. By contrast, neuroticism had a marginal association with disability risk that was eliminated after controlling for depressive symptomatology, and openness and agreeableness were unrelated to disability risk.

CONCLUSIONS

The results suggest that higher levels of extraversion and conscientiousness may be associated with a reduced risk of incident disability in old age.

Sociodemographic correlates of selected health risk behaviors in a representative sample of Australian young people

To facilitate the development of interventions to reduce health risk behavior among young people, we designed this study to compare risk behavior among young people and older people, to compare risk behavior profiles between young men and women, and to identify sociodemographic correlates of risk behavior among young people. Computer-assisted telephone interviews with a representative sample of 19,307 Australian men and women (response rate 73.1%) assessed alcohol consumption, cigarette smoking, injection drug use, and unprotected intercourse. Respondents aged 16 to 24 reported less healthy behavior than older people. Although men and women aged 16 to 24 had similar profiles of health risk behavior, correlates of these behaviors differed for men and women. There were few consistent sociodemographic correlates of different risk behaviors. The results suggest that young women are now as important a priority as young men for interventions. Young people remain an important target group for health promotion, with nonheterosexual young people a particular high-risk group.

Hostility and sex differences in the magnitude, duration, and determinants of heart rate response to forehead cold pressor: Parasympathetic aspects of risk

Recent models hypothesize that hostility confers increased risk of CHD through weaker parasympathetic dampening of cardiovascular reactivity (CVR). We tested this possibility using the forehead cold pressor task, a common maneuver which elicits the "dive reflex" characterized by a reflexive decrease in HR presumably through cardiac-parasympathetic stimulation. Participants were initially chosen from the outer quartiles of a sample of 670 undergraduates screened using the hostility subscale of the Aggression Questionnaire ([Buss, A.H., Perry, M., 1992. The Aggression Questionnaire. Journal of Personality and Social Psychology, 63, 452-459.]). The final sample of 80 participants was evenly divided between men and women and high and low hostility. Following a 10-min baseline, participants underwent a 3-min forehead cold pressor task. The task evoked a significant HR deceleration that was mediated by PNS activation, as assessed by respiratory sinus arrhythmia (RSA). Replicating prior research, men displayed greater decrease in HR. More important, low hostiles maintained larger HR deceleration over time compared to high hostiles although the autonomic basis for this effect was unclear. The findings broaden understanding of hostility and sex-related cardiovascular functioning and support the task as a method for evoking PNS-cardiac stimulation.

Behavior change following a self-management intervention for housebound older adults with arthritis: an experimental study

BACKGROUND

This study examined the impact of a home-based self-management intervention for housebound older adults with arthritis on the adoption of health behaviors. The moderating role of socio-demographic, psychological, and physical characteristics in the process of behavior change was also investigated.

METHODS

Participants were 113 older adult women (n = 102) and men (n = 11) with osteoarthritis (OA) or rheumatoid arthritis (RA) who were randomly assigned to experimental (n = 68) or wait list control (n = 45) groups. Participants were interviewed using standardized questionnaires at baseline, pre-intervention, and post-intervention.

RESULTS

Adjusted multilevel modeling analyses indicated that from pre to post intervention, experimental participants significantly increased their weekly frequency of exercise and relaxation activities. Socioeconomic status and depression played a moderating role in this change for exercise with larger effects occurring among more privileged, non-depressed participants.

CONCLUSION

We conclude that a self-management intervention can successfully improve involvement in exercise and relaxation among housebound older adults with arthritis.

Conceptualizing and measuring ethnic discrimination in health research

This paper presents the General Ethnic Discrimination Scale, an 18-item measure of perceived ethnic discrimination that can be used in health research with any ethnic group. The 1569 participants (half college students, half community adults) completed the General Ethnic Discrimination scale and measures of cigarette smoking and of psychiatric symptoms. Results revealed that the General Ethnic Discrimination subscales model the latent construct of perceived ethnic discrimination equally well for Blacks, Latinos, Asians, and Whites. Discrimination was strongly related to psychiatric symptoms and to current cigarette smoking for ethnic minorities and Whites alike, but such relationships were stronger for ethnic minorities. Minorities who experienced frequent discrimination were 2.3 times more likely than their low-discrimination counterparts to be smokers. This 5th grade reading-level scale takes 10 min to complete and has sufficient, initial psychometric integrity for use in clinical and community health studies.

Shared and unique contributions of anger, anxiety, and depression to coronary heart disease: A prospective study in the normative aging study

BACKGROUND

Anger, anxiety, and depression have each been identified as risk factors for coronary heart disease (CHD). Whether the apparent risk is a function of unique aspects of each emotion or due to a shared underlying dimension of negative affectivity is unclear.

PURPOSE

The goal of this study was to assess shared and unique contributions of anger, anxiety, and depression to incident CHD.

METHODS

Data are from the Veterans Administration Normative Aging Study, an ongoing cohort of older men. Measures of anger, anxiety, and depression were obtained from 1,306 men completing the revised Minnesota Multiphasic Personality Inventory in 1986. From these measures we derived three near-orthogonal scales termed iso(lated)-anger, iso-anxiety, and iso-depression and a fourth scale measuring general distress.

RESULTS

During an average of 10.9 years of follow-up, 161 cases of incident CHD occurred. When considered individually, iso-anxiety, iso-anger, and shared general distress were each associated with CHD risk. When all emotions were considered simultaneously, only iso-anxiety and shared general distress were associated with incident CHD.

CONCLUSIONS

Considering shared versus unique aspects of negative emotions may clarify the nature of their apparent toxicity in relation to CHD risk. General distress shared across negative emotions is an important component in the emotion-CHD relation. Aspects of anxiety may also independently increase CHD risk.

Genetic effects on physical health: lower at higher income levels

Given the robust finding that people in higher income groups tend to experience better physical health, there is interest in identifying mechanisms underlying this gradient. Using a nationwide sample of 719 twin pairs from the National Survey of Midlife Development in the United States, we investigated the possibility that gene-environment interaction underlies the income-health gradient. We observed that genetic variance associated with 2 measures of physical health, number of chronic illnesses and body mass index, each declined significantly with increasing income. This interaction effect could not be removed by adjusting income for the presence of health insurance coverage and education, suggesting that the interaction is not simply a result of differences in levels of those characteristics with income.

Health, wealth, and happiness: financial resources buffer subjective well-being after the onset of a disability

We examined the hypothesis that the relationship between financial status and subjective well-being, typically found to be very small in cross-sectional studies, is moderated by health status. Specifically, we predicted that wealth would buffer well-being after the onset of a disability. Using data from the Health and Retirement Study, a longitudinal study of people at and approaching retirement age, we employed within-subjects analyses to test whether wealth measured prior to the onset of a disability protected participants' well-being from some of the negative effects of a new disability. We found support for this hypothesis: Participants who were above the median in total net worth reported a much smaller decline in well-being after a new disability than did participants who were below the median. We also found some evidence that the buffering effect of wealth faded with time, as below-median participants recovered some of their well-being.

The Association of Interpersonal Stress with Psychological Distress in Romania

Data from a community sample in Romania are presented on how social support and stress in interpersonal relationships are related to psychological distress (depressive symptoms, anxiety, and loneliness). Other predictor variables in the study were stress from daily living, self-efficacy, age, and gender. An important feature was the inclusion of measures of positive and negative aspects of interpersonal relationships. Many studies emphasize either social support, or interpersonal stress, but rarely both. A random population-based sample of 1000 was drawn from age groups 25-29, 40-44 and 75-79. A study questionnaire was mailed to the sample. The analysis sample size was 581 (63 percent of the 922 persons located). The hypothesized relationships between the stressors, the resources, and psychological distress were examined using structural equation models. All the fit statistics indicated a good fit of the data to the model. The variance in psychological distress explained by the predictor variables was 0.83. There were no statistically significant age differences in the relationship between the predictors and psychological distress. Results confirm the study's basic premise, that social support influences psychological distress levels in a protective way, as does self-efficacy, while interpersonal stress and worries about daily living are significant predictors for elevated psychological distress. The study confirms the importance of including measures of positive and of negative social ties in studies of psychological distress in community samples.

Do depression and anxiety mediate the link between educational attainment and CHD?

OBJECTIVE

Depression and anxiety are frequently hypothesized yet rarely examined pathways linking low socioeconomic status (SES) to coronary heart disease (CHD). This study evaluates depression and anxiety as mediators of the association between educational attainment and incident CHD.

METHODS

Subjects (n = 6265, age 25-74) were participants in NHANES I and follow-up studies, a longitudinal, nationally representative study of the US population. Measures of educational attainment and depressive and anxious symptoms (General Well-Being Schedule) were derived from the baseline interview and incident CHD from hospital records and death certificates. Analyses included logistic regression and Cox proportional hazards models.

RESULTS

In fully adjusted models, less than high school (relative risk [RR] = 1.46; 95% confidence interval [CI], 1.15-1.86) and some college (RR = 1.40; 95% CI, 1.05-1.88) education were associated with increased CHD risk relative to a college education. High depressive (RR = 1.31; 95% CI, 1.06-1.61) or anxious (RR = 1.35; 95% CI, 1.13-1.62) symptoms were associated with significantly increased CHD risk relative to low symptoms. Low educational levels were associated with increased risk for high depressive (OR = 3.43; 95% CI, 2.34-5.03) and anxious (OR = 1.71; 95% CI, 1.32-2.22) symptoms. However, depressive and anxious symptoms accounted for little of the association between education and CHD.

CONCLUSION

Education and depressive and anxious symptoms are associated with each other and risk of incident CHD. Although depressive and anxious symptoms are highest among those with lowest levels of education, they do not appear to mediate the relation between educational attainment and incident CHD. Findings suggest the importance of interventions to reduce socioeconomic disadvantage and negative affect in preventing CHD.

Trustful bonds: A key to “becoming a mother” and to reciprocal breastfeeding. Stories of mothers of very preterm infants at a neonatal unit

A preterm birth and subsequent hospitalization of an infant at a neonatal unit (NU) implies an extraordinary life situation for mothers, in which the maternal role and breastfeeding begin and evolve in a medical and unfamiliar setting. Descriptions of how women experience "becoming a mother" and breastfeeding in such a situation are sparse and this question was addressed in the present study. In this qualitative study, inspired by the grounded theory approach, in-depth interviews were conducted with 25 mothers whose very preterm infants had been cared for in seven NUs in Sweden. Findings indicated the importance of quality in social bonds with the infant, father, staff and other mothers at the NU, for "becoming mothers" and experiencing mutually satisfying breastfeeding. Three themes comprised a structure for descriptions of experiences, social bonds and mediated emotions: (1) 'loss' of the infant and the emotional chaos--"putting life on hold"; (2) separation--a sign of being unimportant as a person and mother; and (3) critical aspects of becoming more than a physical mother. The qualities were described as trustful or distrustful, characterized by accompanying feelings of pride/trust or shame/distrust. Social bonds were affected not only by the interpersonal interplay but also by the public environment and care routines. In conclusion, the contextual setting and distrustful social bonds impaired the ability to "become mothers" and the sensation of reciprocity i.e. breastfeeding becoming dutiful and not mutually satisfying. As breastfeeding is an intimate interplay and a personal choice it was considered that the best breastfeeding support would seem to be provision of a favorable environment that enhances the mother's confidence in herself. The contextual setting should be modeled such as to create conditions for a trustful and reciprocal mother-infant bond.

Relationship With Others and Life Satisfaction in Later Life: Do Gender and Widowhood Make a Difference?

In this study we investigated whether social relationship is a stronger determinant of life satisfaction in older women than in older men, and whether this is more obvious in widowed than in married persons, in a representative sample of Chinese individuals aged 60 or older in Hong Kong (N=1,616). We tested the moderating effect of gender and widowhood by means of a multigroup analysis in structural equation modeling that incorporated other major predictors of life satisfaction. Consistent with predictions, relatedness was much more important for women than for men. Furthermore, relatedness was the most important determinant of life satisfaction in women, regardless of marital status, but it was only a moderate predictor in married men, and even an irrelevant factor in widowers. We discuss the results in terms of how gender roles shape relationship goals, and thus how men and women evaluate life satisfaction differently in the context of relationship with others.

Social support and coronary heart disease: epidemiologic evidence and implications for treatment

OBJECTIVE

The present paper reviews theories of social support and evidence for the role of social support in the development and progression of coronary heart disease (CHD).

METHODS

Articles for the primary review of social support as a risk factor were identified with MEDLINE (1966-2004) and PsychINFO (1872-2004). Reviews of bibliographies also were used to identify relevant articles.

RESULTS

In general, evidence suggests that low social support confers a risk of 1.5 to 2.0 in both healthy populations and in patients with established CHD. However, there is substantial variability in the manner in which social support is conceptualized and measured. In addition, few studies have simultaneously compared differing types of support.

CONCLUSIONS

Although low levels of support are associated with increased risk for CHD events, it is not clear what types of support are most associated with clinical outcomes in healthy persons and CHD patients. The development of a consensus in the conceptualization and measurement of social support is needed to examine which types of support are most likely to be associated with adverse CHD outcomes. There also is little evidence that improving low social support reduces CHD events.

Relation of childhood socioeconomic status and family environment to adult metabolic functioning in the CARDIA study

OBJECTIVE

Low SES and a conflict-ridden, neglectful, or harsh family environment in childhood have been linked to a high rate of physical health disorders in adulthood. The objective of the present investigation was to evaluate a model of the pathways that may help to explain these links and to relate them to metabolic functioning (MF) in the Coronary Artery Risk Development In Young Adults (CARDIA) dataset.

METHODS

Participants (n = 3225) in the year 15 assessment of CARDIA, age 33 to 45 years, completed measures of childhood socioeconomic status (SES), risky early family environment (RF), adult psychosocial functioning (PsyF, a latent factor measured by depression, hostility, positive and negative social contacts), and adult SES. Indicators of the latent factor MF were assessed, specifically, cholesterol, insulin, glucose, triglycerides, and waist circumference.

RESULTS

The overall prevalence of metabolic syndrome was 9.7%. Structural equation modeling indicated that childhood SES and RF are associated with MF via their association with PsyF (standardized path coefficients: childhood SES to RF -0.13, RF to PsyF 0.44, PsyF to MF 0.09, all p < .05), but also directly (coefficient from childhood SES to MF -0.12, p < .05), with good overall model fit. When this model was tested separately for race-sex subgroups, it fit best for white women, fit well for African-American women and white men, but did not fit well for African-American men.

CONCLUSIONS

These results indicate that childhood SES and early family environment contribute to metabolic functioning through pathways of depression, hostility, and poor quality of social contacts.

Socioeconomic Characteristics of the Community in Childhood and Cognition in Old Age

We examined the relation of early life socioeconomic circumstances to cognition in older residents of a biracial urban community. Participants had brief cognitive testing three times at approximately 3-year intervals. At baseline, information about early life household and county socioeconomic level was collected. In mixed-effects models adjusted for age, sex, race, and education, both early life household and county socioeconomic levels were positively associated with baseline level of cognition but unrelated to cognitive decline. The results suggest that socioeconomic conditions in early life are associated with level of cognitive function in old age but not with rate of cognitive decline.

The impact of social deprivation on chronic back pain outcomes

Chronic low back pain is the commonest cause of disability for adults of working age. It is a complex problem frequently encapsulated as a bio-psychosocial issue, yet the social element has received less attention than it deserves, particularly for low-income and socially deprived patients. Rehabilitation programmes are often based on increasing function through cognitive and behavioural techniques, which, for many reasons, may be less effective for the socially disadvantaged. In this paper we discuss the potential barriers to successful rehabilitation in socially deprived groups and we look at possible factors that may need to be considered when designing interventions.

Racial/ethnic differences in adolescents' physical symptoms

This study was conducted to establish race/ethnic-specific prevalence for 10 physical symptoms in American youths and to examine the extent to which socioeconomic status and depressive symptoms explained racial differences in those symptoms. This descriptive study was based on a cross-sectional analysis of survey data from Wave I of the National Longitudinal Study of Adolescent Health including a school-based sample of over 20,000 adolescents in Grades 7 through 12. Self-reported physical symptoms during the past 12 months were examined. White youths reported the highest frequency of headaches, musculoskeletal pain, and dizziness; feeling hot, chest pain, cold sweats, and urinary symptoms were more common in Black youths. The three symptoms reported by Whites remained significant after controlling for family income and depressive symptoms, whereas racial differences in the four symptoms prominent in Blacks were accounted for by family income and depressive symptoms. Findings highlight racial differences in symptom types and in psychosocial factors contributing to physical symptoms in adolescents and warn against health-care providers' stereotyping associations between physical symptoms and socioeconomic status.

Predictors of physical health: toward an integrated model of genetic and environmental antecedents

People in higher-income groups tend to experience better physical health, yet this does not appear to be the direct result of access to medical care. This has prompted a search for psychological factors more likely to be present in high-income environments that might help to explain the relationship. Physical health has been associated with a number of such psychological measures including positive affect and well-being, negative affect and neuroticism, positive social relationships, and perceived control. Building from recent findings of moderation of genetic variance in physical health by income and perceived control, we explore the genetic and environmental relationships among all these variables in a nationwide U.S. twin sample. These relationships suggest possible mechanisms by which psychological characteristics, behaviors, physical health, and environmental circumstances could be influenced by common groups of genes with varying degrees of activity in different environments. We discuss the implications of such mechanisms for differential expression of genetic variation in the population and suggest ways in which consideration of such effects can inform gerontology research.

Socioeconomic status, resources, psychological experiences, and emotional responses: a test of the reserve capacity model

The current study used ecological momentary assessment to test several tenets of the reserve capacity model (L.C. Gallo & K. A. Matthews, 2003). Women (N = 108) with varying socioeconomic status (SES) monitored positive and negative psychosocial experiences and emotions across 2 days. Measures of intrapsychic and social resources were aggregated to represent the reserve capacity available to manage stress. Lower SES was associated with less perceived control and positive affect and more social strain. Control and strain contributed to the association between SES and positive affect. Lower SES elicited greater positive but not negative emotional reactivity to psychosocial experiences. Women with low SES had fewer resources relative to those with higher SES, and resources contributed to the association between SES and daily experiences.

Role of socialization in explaining social inequalities in health

This paper argues that social selection, materialist/structural and cultural/behavioural explanations for social inequalities in health are related to each other through the mechanism of socialization, seen here as a process through which societies shape patterns of behaviour and being that then affect health. Socialization involves the inter- and intragenerational transfer of attitudes, beliefs and behaviours. Parallels between socialization theory and Bourdieu's concept of habitus are also drawn, and the implications for social epidemiology are discussed. Four key areas that would benefit from research within the socialization framework are identified: health behaviours, psychological vulnerability, social skills and future time perspective.

Personality development: stability and change

In this review, we evaluate four topics in the study of personality development where discernible progress has been made since 1995 (the last time the area of personality development was reviewed in this series). We (a) evaluate research about the structure of personality in childhood and in adulthood, with special attention to possible developmental changes in the lower-order components of broad traits; (b) summarize new directions in behavioral genetic studies of personality; (c) synthesize evidence from longitudinal studies to pinpoint where and when in the life course personality change is most likely to occur; and (d) document which personality traits influence social relationships, status attainment, and health, and the mechanisms by which these personality effects come about. In each of these four areas, we note gaps and identify priorities for further research.

Socioeconomic disparities in health: the impact of pharmacotherapy

Along with age and gender, socioeconomic status is a fundamental driver of health. This review discusses the meaning of socioeconomic status and how it influences health across a person's life. Particular attention is paid to the role of psychosocial stress and self-determination. Through various pathways, socioeconomic status may affect biologic aging. This review also discusses the implications of the socioeconomic status-health relationship for understanding international differences in population health such as differences in life expectancy. The review concludes with a discussion of the implications of these findings for national policies and the potential impact of pharmacotherapy.