Shift work, parental cardiovascular disease and myocardial infarction in males.

Background: Shift work has been associated with an increased risk of cardiovascular disease (CVD). However, there is a need for more studies to determine whether there is an interaction between shift work and other risk factors of CVD, thereby increasing the risk of CVD in shift workers. Aims: To discern whether shift work and parental mortality from myocardial infarction (MI) or sudden cardiac death (SCD) interact to increase the risk of MI in men. Methods: A case-control dataset was used to assess interaction between shift work and parental history of CVD, using death from MI or SCD, or death before age 65, on an additive scale. Results were reported as relative excess risk due to interaction, attributable proportion due to interaction (AP) and synergy index (SI). Results: There was an interaction between shift work and paternal mortality from MI or SCD, when both factors were present [SI = 2.39; 95% confidence interval (CI) 1.02‒5.6 and AP = 0.4; 95% CI 0.08‒0.73]. Conclusions: Paternal mortality from MI or SCD interacts with shift work to increase the risk of MI in men.

Can school-related factors predict future health behaviour among young adolescents?

Although the prevention of unfavourable health behaviour among young people has high priority in public health, the possibility of finding risk factors at school has not been sufficiently studied. The objective of this study was to find predictors among young pupils for later unfavourable health behaviour, with special focus on school-related factors.A three-year prospective study was started in 1994 including 279 pupils (141 girls and 138 boys) from different socio-economic areas. The pupils answered a comprehensive questionnaire in grade six and grade nine. The non-response rate was negligible. The best predictors for health behaviour among boys and girls in grade nine were factors related to earlier health/health behaviour. The results also indicated that school-related factors could predict future health behaviour, especially in relation to low physical activity among girls. The school has an important role to play in identification of future unfavourable health behaviour among pupils at the school, both directly through recognising school-related risk factors and also indirectly through paying special attention to pupils with unfavourable health/health behaviour. Our findings indicate the need for more research in younger ages, as negative health behaviour already seems to be established at 12 y of age.