Interactions between parental and personal socioeconomic resources and self-rated health: Adjudicating between the resource substitution and resource multiplication theories.

A small body of research has documented intriguing findings, mostly from the United States but also from Europe, which suggest that the positive health effects of socioeconomic resources in adulthood may be conditioned by socioeconomic circumstances in childhood. There are two competing theories in this literature. The first contends that socioeconomic resources have a stronger effect on adult health for people from disadvantaged backgrounds because socioeconomic resources in adulthood substitute or compensate for a paucity of health-related resources earlier in life. The second contends that socioeconomic resources have a stronger effect on adult health for people from advantaged backgrounds because socioeconomic resources in adulthood compound or multiply the health effects of socioeconomic resources earlier in life. We used survey data from the 2012 Longitudinal and International Study of Adults linked to current and historical income data from the Canada Revenue Agency to investigate interactions between parental and personal socioeconomic resources - education and income, treated separately - as predictors of self-rated health in a sample of Canadians aged 25 to 50. Consistent with the resource multiplication theory, we found that the presumed benefits of personal family income for self-rated health were stronger for women from wealthier backgrounds than for women from poorer backgrounds. We found no evidence to support either theory among men. Overall, none of the interactions involving the education of parents or their adult children reached statistical significance. Our results are indicative of the importance of distinguishing between education and income for adults and their parents when adjudicating between these two theories.