“…Wave numbers were deducted with one, so that the intercepts in the estimated models of depressive symptoms can be interpreted more intuitively. Given their known associations with health behaviours (Feng et al, 2021;Grundy & Read, 2015;Margolis, 2013;Van den Broek, 2021a;Van den Broek & Fleischmann, 2021) as well as with mental health (Chen et al, 2017;Feng et al, 2019;Grundy et al, 2019;Read et al, 2016;Van den Broek, 2021b;Zhai et al, 2015), age, gender, level of urbanization of location of residence, level of education, marital status, number of children, and co-residence with a child were moreover considered as potential confounders. Time-invariant covariates were gender (male/female), age at baseline in years (centred on the sample mean), educational attainment (at least upper secondary education/lower secondary education or lower]), level of urbanization of location of residence (urban/rural) and number of living children (0/1/2/3/≥4).Time-varying covariates were co-residence with at least one child (no/yes) and partner status (not partnered [separated, divorced, widowed, or never married]/partnered [currently married or cohabiting]).An overview of sample characteristics is provided in Table 1.…”