The mediating effect of effort-reward imbalance in household and family work on the relationship between education and women's health

Occupational stress as a key determinant for explaining health inequalities has been well established while the impact of stress related to family work has rarely been considered. This study investigates whether stress in household and family work may contribute to health inequalities in women. We used a population-based sample of German mothers (n = 3129) to determine the total, direct and indirect effects of education on somatic complaints by means of OLS regression-based mediation models. Inference about indirect effects was determined by 95% bias corrected bootstrap confidence intervals. Education was assessed by a measure combining school education and vocational training. Stress was measured using the adopted effort-reward-imbalance (ERI) questionnaire for household and family work. The von Zerssen list of somatic complaints was used as measure of subjective health. We found a significant total effect of education on somatic complaints (p ≤ 0.001) as well as significant indirect effects through 'effort' (p = 0.006) and 'reward' in household and family work (p ≤ 0.001). However, the subscales of ERI pointed into different directions: while levels of 'effort' increased with women's educational attainment, levels of distress related to low 'reward' decreased with higher levels of education. Our findings suggest that the effect of women's education on somatic complaints is mediated through stress related to low reward for household and family work. In particular, lack of 'societal esteem' for household and family work contributed to health disadvantages in lower educated mothers. We conclude that research on health inequality would benefit from taking stressful experiences in household and family work greater into account.