As described above and previously (2, 11, 27), information from various national registries is available across different time frames, which impacts the cohorts for which specific combinations of data are available. The current analyses incorporate the risk conferred by biological parental behavior; accordingly, we were limited to cohorts for whom biological parental data was available. We therefore examined outcomes for individuals born in Sweden between 1970 and 1984, for whom data on young adult (age 19–24) AUD were available. These individuals were divided into three cohorts to account for potential differences in the social environment over time. We included individuals who did not emigrate or die before age 24 and who had two registered biological parents in the multi-generation register. No further limitations were made for the parents.
