Cohort effects of women's mid-life binge drinking and alcohol use disorder symptoms in the United States: Impacts of changes in timing of parenthood.

Background And Aims: Alcohol use is increasing among women in mid-life concurrently with societal changes in timing of parenthood and changing cultural norms, which may influence alcohol use. The aim of this study was to determine if age of first parenting was associated with excessive drinking [i.e. past 2-week binge drinking and past 5-year alcohol use disorder (AUD) symptoms] among women during mid-life in the United States and to determine if there were pronounced cohort effects influencing these relationships.

Design: This was a retrospective cohort, longitudinal study.

Setting, Participants And Measurements: Data were drawn from the Monitoring the Future survey, an annual ongoing survey of high school students' substance use behaviors in the United States. Participants were women who completed the age 35 survey between 1993 and 2019, corresponding to high school senior years 1976-2002 (n = 9988). Past 2-week binge drinking and past 5-year AUD symptoms were self-reported. Age of first parenting was self-reported.

Findings: Binge drinking and AUD symptoms were higher among women in recent than in older cohorts. Women from the 2018-19 cohort had increased odds of binge drinking [odds ratio (OR) = 1.73, 95% confidence interval (CI) = 1.41-2.12] and AUD symptoms (OR = 1.51, CI = 1.27-1.80) relative to women from the 1993-97 cohort. Throughout cohorts, there was an inverse association between transition to parenthood and excessive drinking outcomes (e.g. range for ORs for binge drinking among those without children compared with those who had had children between the ages of 18 and 24: 1.22-1.55). Simultaneously, there was a population shift towards delaying parenting in recent cohorts (i.e. 54% of women in the 1993-97 cohort had children before age 30 compared with 39% in the two recent cohorts), increasing the size of the group at highest risk for excessive drinking.

Conclusions: In the United States, subgroups of women at highest risk of excessive drinking appear to be expanding, probably supported in part by a trend towards delayed parenting.