Maternal depression is a potent risk factor for poor child development across a number of domains but the mechanisms of transmission are poorly understood. This study aimed to test competing mediators of the association between pre-conception maternal depression and child psychosocial functioning. In 2016, mothers in the 1973-1978 cohort of the Australian Longitudinal Study on Women's Health were asked to be part of the Mothers and their Children's Health study and to complete surveys on the health of their three youngest children under 13 years. The current study includes children aged 0-12 years (N = 5532, M = 6.99 years, SD = 3.22 years) and their mothers (N = 2917). We used the CESD-10 to measure depression and the PedsQL to measure psychosocial functioning, and used multilevel structural equation modeling to test hypotheses. Pre-conception maternal depression was associated with poorer maternal mental health and parenting after birth. The effect of pre-conception maternal depression was mediated by post-birth maternal depression in children aged 0-4 years (unstandardized regression coefficient (B) = - 0.26, 95%CI - 0.38, - 0.13) and children aged 5-12 years (B = - 0.25, 95%CI - 0.34, - 0.16), and by post-birth maternal stress (B = - 0.04, 95%CI - 0.08, - 0.01), and parenting (B = - 0.03, 95%CI - 0.04, - 0.02) in children aged 5-12 years. Post-birth maternal depression was the strongest mediator. Pre-conception is the optimal time for depression intervention. Post-birth interventions should include a focus on reducing depression and improving negative parenting aspects such as hostility and discipline.
Keywords: Child health-related quality of life; Maternal depression; Mediators; Parenting.