International journal of epidemiology
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Previous studies on the association between childhood infections and childhood leukaemia have produced inconsistent results, likely due to the recall error/bias of infection data reported by the parents. The current study used a population-based and record-based case-control design to evaluate the association between childhood leukaemia and infections using the National Health Insurance Research Database of Taiwan. ⋯ Children with leukaemia may have a dysregulated immune function present at an early age, resulting in more episodes of symptomatic infections compared with healthy controls. However, confounding by other infectious measures such as birth order and day care attendance could not be ruled out. Finally, the results are only relevant to the medically diagnosed infections.
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Comparative Study
Longitudinal study of mortality among refugees in Sweden.
Refugee immigrants have poorer health than other immigrant groups but little is known about their mortality. A comparison of mortality among refugees and non-refugee immigrants is liable to exaggerate the former if the latter includes labour migrants, whose mortality risk may be lower than that of the general population. To avoid bias, labour migrants are not included in this study. The aim was to investigate mortality risks among refugees compared with non-labour non-refugee immigrants in Sweden. ⋯ Refugee men in Sweden have a higher mortality risk in cardiovascular and external causes compared with male non-labour non-refugee immigrants. This study suggests that the refugee experience resembles other stressors in terms of the association with cardiovascular mortality.
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Regular alcohol drinking contributes both favourably and adversely to health in the Western populations, but its effects on overall and cause-specific mortality in China are still poorly understood. ⋯ Among Chinese men aged 40-79 years, regular alcohol drinking was associated with a small but definite excess risk of overall mortality, especially among smokers.