All possible interaction terms between parental alcohol use and the child's age or sex or the confounders and mediators mentioned above were tested in the model controlling for demography and both parent's alcohol use. The possible interaction effect between paternal and maternal alcohol use was also tested. In total 15 possible interactions were tested. Bonferroni adjustment would have suggested α = 0.003. This is, however, known to be too conservative and to reduce the power of the study [54], so to share trends with the reader, interaction effects with p < 0.01 are reported.
