Incidence of shoulder and neck pain in a working population: effect modification between mechanical and psychosocial exposures at work? Results from a one year follow up of the Malmö shoulder and neck study cohort.

STUDY OBJECTIVE: To assess the impact of mechanical exposure and work related psychosocial factors on shoulder and neck pain. DESIGN: A prospective cohort study. PARTICIPANTS: 4919 randomly chosen, vocationally active men and women ages 45-65 residing in a Swedish city. Neck and shoulder pain were determined by the standardised Nordic questionnaire. Mechanical exposure was assessed by an index based on 11 items designed and evaluated for shoulder and neck disorders. Work related psychosocial factors were measured by the Karasek and Theorell demand-control instrument. MAIN RESULTS: High mechanical exposure was associated with heightened risk for shoulder and neck pain among men and women during follow up. Age adjusted odds ratios (OR) were 2.17 (95% confidence intervals (CI): 1.65, 2.85) and 1.59 (95% CI: 1.22, 2.06), respectively. In women, job strain (high psychological job demands and low job decision latitude) correlated with heightened risk (OR = 1.73, 95% CI: 1.29, 2.31). These risk estimates remained statistically significant when controlled for high mechanical exposure regarding job strain (and vice versa), and for sociodemographic factors. Testing for effect modification between high mechanical exposure and job strain showed them acting synergistically only in women. CONCLUSION: Job related mechanical exposure in both sexes, and psychosocial factors in women, seem independently of each other to play a part for development of shoulder and neck pain in vocationally active people. The effect of psychosocial factors was more prominent in women, which could be the result of biological factors as well as gender issues. These results suggest that interventions aiming at reducing the occurrence of shoulder and neck pain should include both mechanical and psychosocial factors.

Parental economic stress: evidence of an overlooked public health risk among Swedish families.

BACKGROUND: Studies have demonstrated that when parents shoulder considerable financial responsibilities, adverse health outcomes may occur. The present study assesses the association between economic stress and self-rated health in a sample of Swedish parents, and especially how this relation is affected by foreign origin and employment status. METHODS: A questionnaire was sent to a random sample of 5,600 individuals between the ages of 21 and 81 in Malmö, Sweden. The total response rate was 69%. Among the respondents, 824 were parents having at least one child living at home. The main exposures were such sociodemographic variables as country of origin and employment status, and economic stress. The outcome variable was self-rated health. RESULTS: Of the parents in the study, the 34.7% coded as exposed to economic stress showed a significantly increased odds ratio for poor self-rated health (OR=3.12, 95% CI: 2.01-4.84) adjusted for age and sex. After controlling for foreign origin and unemployment, the odds ratio remained statistically significant regarding exposure to economic stress (OR=1.94; 1.16-3.23). In the multivariate model, foreign origin and unemployment were also strongly associated with poor self-rated health (OR=1.78, 95% CI: 1.12-2.88; OR=1.67, 95% CI: 1.01-2.75, respectively). The adjusted population-attributable risk for poor self-rated health was estimated to be 27.4% for economic stress, 26.6% for foreign origin, and 16.7% for unemployment. CONCLUSIONS: Parental economic stress was associated with low self-rated health to a statistically significant degree, even when accounting for employment status and foreign origin. It, therefore, deserves to be seriously considered as an potential public health risk factor among Swedish families.

Social network, social support and the rate of decline of CD4 lymphocytes in asymptomatic HIV-positive homosexual men.

AIMS: To test a stress-disease hypothesis by investigating the influence of social network and social support factors on the course over time of the CD4 lymphocytes in an HIV-positive population of gay men. METHODS: The study is a prospective cohort study of a representative population of HIV-positive gay men, undertaken at the Department of Infectious Diseases, Malmö University Hospital. This is the only clinic providing care for HIV-positive individuals in the city of Malmö in southern Sweden (population 248,000). A total of 115 HIV-positive homosexual men, who had not received an AIDS diagnosis, were invited to take part in the study. Seventy-five men (65%) accepted to be interviewed and 64 men (56%) fulfilled the inclusion criteria for the statistical analysis. RESULTS: In a multivariate analysis adjustments were made for age, level of the first CD4 count and time since first contact with the clinic. Men with high family contact frequency had a longer half-life (20.3 years) of the CD4 lymphocyte count than men with a low family contact frequency (7.4 years) (p = 0.03). Men with high social participation also had a longer half-life of CD4 lymphocyte count (14.7 years), compared with men with low social participation (6.3 years, p = 0.10). CONCLUSIONS: The findings of this study imply the importance of social support and social network factors as modifiers of the rate of decline of the CD4 lymphocyte level, which is an important prognostic marker of survival in HIV-positive homosexual men.