Social and psychological predictors of body mass index among South Africans 15 years and older: Sanhanes-1

This study investigated how psychological distress and the proxies for social position combine to influence the risk of both underweight and overweight in South Africans aged 15 years and older. This was a cross-sectional study that included 2254 men and 4170 women participating in the first South African National Health and Nutrition Examination Survey (SANHANES-1). An analysis exploring the associations of social and mental health characteristics with body mass index (BMI) was conducted using binary and multinomial logistic regressions. Results suggested that, overall, women had a higher risk of overweight/obesity compared to men (age-adjusted odds ratio [AOR] 4.65; 95% confidence intervals [CI] 3.94–5.50). The gender effect on BMI was smaller in non-African participants (AOR 3.02; 95% CI 2.41–3.79; p-value for interaction = 0.004). Being employed and having a higher level of education were associated with higher risks of overweight and obesity and a lower risk of underweight. Being single or without a spouse and poor mental health were found to increase the odds of being underweight, especially in men. To conclude, there are strong social gradients and important gender and ethnic differences in how BMI is distributed in the South African population

Psychosocial functioning and intelligence both partly explain socioeconomic inequalities in premature death. A population-based male cohort study

The possible contributions of psychosocial functioning and intelligence differences to socioeconomic status (SES)-related inequalities in premature death were investigated. None of the previous studies focusing on inequalities in mortality has included measures of both psychosocial functioning and intelligence.The study was based on a cohort of 49 321 men born 1949-1951 from the general community in Sweden. Data on psychosocial functioning and intelligence from military conscription at ∼18 years of age were linked with register data on education, occupational class, and income at 35-39 years of age. Psychosocial functioning was rated by psychologists as a summary measure of differences in level of activity, power of initiative, independence, and emotional stability. Intelligence was measured through a multidimensional test. Causes of death between 40 and 57 years of age were followed in registers.The estimated inequalities in all-cause mortality by education and occupational class were attenuated with 32% (95% confidence interval: 20-45%) and 41% (29-52%) after adjustments for individual psychological differences; both psychosocial functioning and intelligence contributed to account for the inequalities. The inequalities in cardiovascular and injury mortality were attenuated by as much as 51% (24-76%) and 52% (35-68%) after the same adjustments, and the inequalities in alcohol-related mortality were attenuated by up to 33% (8-59%). Less of the inequalities were accounted for when those were measured by level of income, with which intelligence had a weaker correlation. The small SES-related inequalities in cancer mortality were not attenuated by adjustment for intelligence.Differences in psychosocial functioning and intelligence might both contribute to the explanation of observed SES-related inequalities in premature death, but the magnitude of their contributions likely varies with measure of socioeconomic status and cause of death. Both psychosocial functioning and intelligence should be considered in future studies

Life course determinants of coronary heart disease and stroke in middle-aged Swedish men

The general aim of the thesis was to study how socioeconomic and behaviour-related factors measured in childhood, late adolescence or adulthood are related to coronary heart diseae (CHD) and stroke in middle age among Swedish men. The life course approach was central to the aim, and the potential impact of socioeconomic differences in adulthood among the men was considered throughout. The thesis was based on the 1969 conscription cohort, i.e. a cohort of almost 50 000 Swedish men who in 1969/70 went through a conscription examination for compulsory military service. They were between 18 and 20 years of age at that time. Information from physiological assessments, cognitive tests, and questionnaires were used in combination with (1) register-based indicators of social circumstances in childhood and adulthood, and information on educational level, and (2) register-based information on fatal and non-fatal events of CHD and stroke between 1971 and 2007. Multivariable regression methods were used to analyse data. In study I and II, higher levels of BMI and blood pressure in late adolescence were shown to be significantly associated with increased risks of CHD and stroke before 55 years of age. Men with higher BMI were more likely to be in lower socioeconomic positions later in adulthood, but differences among the men in adult socioeconomic positions did not seem to affect, i.e. mediate or modify, associations between BMI/blood pressure in late adolescence and CHD/stroke in middle age. BMI, smoking, and body height in late adolescence were shown, in study III, to contribute to explain associations between childhood socioeconomic position and CHD/stroke in middle age. Possibly, study III also showed that childhood social disadvantage may have an independent long-term effect on CHD and stroke in middle age. In study IV, it was shown that large parts of the associations between educational attainment and CHD/stroke in middle age may be explained by confounding from social and behaviour-related risk factors measured in childhood and late adolescence. Thus, it was shown that factors in childhood and adolescence may be critical in relation to CHD and stroke in middle age among men. Increased risks of CHD and stroke could be an effect of disadvantages in childhood, acting through biological and/or behavioural development early in life. The findings may also be compatible with the view that social disadvantages and adverse behavioural responses from childhood and onwards increase risks of disease, such as CHD and stroke, in a cumulative manner over the life course. Moreover, the findings showed that such accumulation of cardiovascular risk may be most prevalent among men born to parents of lower socioeconomic positions and among men who attain lower educational levels; these are the same categories of men that tend to end up in lower socioeconomic positions in adulthood. In this way, social differences in cardiovascular disease among adult men could possibly be explained by confounding from factors earlier in life

The meaning of decision latitude in registered nurses’ night work

Purpose For many employees today, the work situation and work content differ from those of the industrial workers that were originally in mind when the well-known demand-control-support model was developed. The aim of this study was to gain a deeper understanding of the meaning of control, i.e., decision latitude, in post-industrial society, using night-working registered nurses as an example. Methods As an example of a modern human service occupation in a value-based organization we choose registered nurses. Twenty-nine registered nurses from 11 departments at three different hospitals participated in semi-structured interviews. The analysis used a thematic approach and was deductive, based on an operationalization of decision latitude. Results Findings indicate that the specific meaning of decision latitude is influenced by the specific work organization. Moreover, decision latitude appears to interact in a complex way with demands and support at work. Conclusions Decision latitude appears to be influenced by the specific work organization. Thus, when we address self-reported decision latitude, it can have different meanings and potentially different effects in different contexts. Moreover, the interface and interplay between the three constructs decision latitude, demand and support seems to be relevant and complex

Personality by intelligence interaction effects on grades tend to be synergistic

Earlier research has identified personality traits × intelligence interaction effects on academic performance. The present study, employing data from the 1997 National Longitudinal Survey of Youth (NLSY97, N = 8984), identified some interaction effects, mainly involving indicators of dependability, on high school grades. The interaction effects tended to be synergistic, meaning that the association between the trait and grades tended to strengthen with increased intelligence. This could be due to a sufficient level of intelligence being necessary for higher grades, and that lack thereof cannot be compensated for by a high degree of some advantageous personality trait. However, a positive association between intelligence and reliability in the measurement of personality, as well as a reversed causal effect of grades on self-rated personality moderated by intelligence, could also be contributing causes to the tendency for synergistic interaction effects

Cognitive ability in late adolescence and disability pension in middle age: follow-up of a national cohort of Swedish males.

Low cognitive ability in late adolescence has previously been shown to be associated with disability pension (DP) in young adulthood. However, most DP's are granted later in working life, and the mechanisms of the association are not fully understood. We aimed to investigate the association between cognitive ability in late adolescence and DP at ages 40-59, and investigate the role of individual and socioeconomic factors. Information on cognitive ability, health status, personality aspects and health behaviours at age 18-20 was obtained from the 1969-70 conscription cohort, comprising 49,321 Swedish men. Data on DP's 1991-2008 was obtained from the Longitudinal Database of Education, Income and Employment. Information on socioeconomic and work-related factors in childhood and adulthood was obtained from national sociodemographic databases. Hazard ratios for DP during follow-up were estimated by Cox proportional hazards models. We found a graded relationship between cognitive ability in late adolescence and DP in middle age. One step decrease on the nine-point stanine scale of cognitive ability was associated with a crude hazard ratio of 1.26 (95% CI 1.24-1.27). Socioeconomic and work-related circumstances in adulthood explained much of the association, but factors measured already in late adolescence also showed importance. The findings suggest an accumulation of risks over the life course. Although attenuated, the graded relationship remained after adjusting for all factors

Risk of Coronary Heart Disease in Men With Poor Emotional Control:A Prospective Study

Objective Many psychosocial factors have been associated with coronary heart disease (CHD), including hostility, anger, and depression. We tested the hypothesis that these factors may have their basis in emotion regulation abilities. Our aim was to determine whether poor emotional control predicted long-term risk of CHD. Methods This Swedish national study includes 46,393 men who were conscripted for military service in 1969 and 1970. The men were aged 18 to 20 years at the time of conscription. Psychologists used a brief semistructured interview to retrospectively assess the conscripts' level of emotional control in childhood and adolescence. The outcome measure was a first fatal or nonfatal event of CHD. We calculated hazard ratios (HRs) and 95% confidence intervals (CIs) for poor and adequate versus good emotional control. Results After 38 years of follow-up (1971-2009), 2456 incident cases of CHD had occurred. Poor emotional control increased the risk of CHD (HR = 1.31, 95% CI = 1.18-1.45), adjusting for childhood socioeconomic position, anxiety, depression, and parental history of CHD. Further adjustment for life-style-related factors, for example, smoking and body mass index, attenuated the HR to 1.08 (95% CI = 0.97-1.21). In stratified analyses, the fully adjusted association between poor emotional control with CHD remained significantly elevated among men with a parental history of CHD (HR = 1.49, 95% CI = 1.11-2.01, p interaction = .037). Conclusions In the overall study population, poor emotional control had no direct effect on CHD beyond life-style-related factors. However, in men with a parental history of CHD, poor emotional control in adolescence remained significantly predictive of long-term CHD risk even when adjusting for life-style-related factors

Intelligence and Disability Pension in Swedish Men and Women Followed from Childhood to Late Middle Age.

ObjectiveTo investigate the association between intelligence and disability pension due to mental, musculoskeletal, cardiovascular, and substance-use disorders among men and women, and to assess the role of childhood social factors and adulthood work characteristics.MethodsTwo random samples of men and women born 1948 and 1953 (n = 10 563 and 9 434), and tested for general intelligence at age 13, were followed in registers for disability pension until 2009. Physical and psychological strains in adulthood were assessed using job exposure matrices. Associations were examined using Cox proportional hazard regression models, with increases in rates reported as hazard ratios (HRs) with 95% confidence intervals (95%CI) per decrease in stanine intelligence.ResultsIn both men and women increased risks were found for disability pension due to all causes, musculoskeletal disorder, mental disorder other than substance use, and cardiovascular disease as intelligence decreased. Increased risk was also found for substance use disorder in men. In multivariate models, HRs were attenuated after controlling for pre-school plans in adolescence, and low job control and high physical strain in adulthood. In the fully adjusted model, increased HRs remained for all causes (male HR 1.11, 95%CI 1.07-1.15, female HR 1.06, 95%CI 1.02-1.09) and musculoskeletal disorder (male HR 1.16, 95%CI 1.09-1.24, female HR 1.08, 95%CI 1.03-1.14) during 1986 to 2009.ConclusionRelatively low childhood intelligence is associated with increased risk of disability pension due to musculoskeletal disorder in both men and women, even after adjustment for risk factors for disability pension measured over the life course

Dangers of residual confounding: A cautionary tale featuring cognitive ability, socioeconomic background, and education

Cognitive ability and socioeconomic background (SEB) have been previously identified as determinants of achieved level of education. According to a “discrimination hypothesis”, higher cognitive ability is required from those with lower SEB in order to achieve the same level of education as those with higher SEB. Support for this hypothesis has been claimed from the observation of a positive association between SEB and achieved level of education when adjusting for cognitive ability. Here we propose a competing hypothesis that the observed association is due to residual confounding. To adjudicate between these hypotheses, we tested both on data from the 1997 National Longitudinal Survey of Youth (NLSY97, N = 8984), including a check of the logic where we switched places between predictor and outcome. We found the expected positive association between SEB and achieved level of education when adjusting for cognitive ability (predicted by both hypotheses), but we also observed a positive association between cognitive ability and SEB when adjusting for level of education (predicted only by the residual confounding hypothesis). Under the logic of the discrimination hypothesis, a contradictory interpretation emerges: higher cognitive ability is required from those with higher SEB in order to achieve the same level of education as those with lower SEB. These results highlight the potential use of reversing predictors and outcomes to test the logic of hypothesis testing, and support a residual confounding hypothesis over a discrimination hypothesis in explaining associations between SEB, cognitive ability, and educational outcome