Within-quintile comparisons of EA family background characteristics are presented in Table 4. Among EA families, prevalence of parental separation ranged from 10% (0–20%ile of propensity score distribution) to 77% (>80%ile). Prevalence of parental alcoholism increased across quintile, as did prevalence of maternal smoking, mothers who gave birth as teens, and fathers who left school before grade 12. Although there was questionable matching on paternal alcoholism in the >80%ile families, where alcoholic fathers were over-represented, intact and separated EA families were well-matched overall and thus we proceeded with comparisons of EA offspring.
