Study concept and design: Saitz, Meli, Samet.
Acquisition of data: Saitz, Kim, Meli, Samet.
Analysis and interpretation of data: All authors.
Drafting of the manuscript: Saitz, Meli.
Critical revision of the manuscript for important intellectual content: Saitz, Cheng, Winter, Kim, Allensworth-Davies, Lloyd-Travaglini, Samet.
Statistical analysis: Cheng, Winter, Lloyd-Travaglini.
Obtained funding: Saitz, Meli, Samet.
Administrative, technical, or material support: Saitz, Kim, Meli, Allensworth-Davies.
Study supervision: Saitz, Meli.
Conflict of Interest Disclosures: All authors have completed and submitted the ICMJE Form for Disclosure of Potential Conflicts of Interest. Dr Cheng reports having served on data monitoring committees for Johnson & Johnson and Janssen. No other disclosures were reported.
Funding/Support: The AHEAD study was funded by grant R01 AA010870 from the National Institute on Alcohol Abuse and Alcoholism and grant R01 DA010019 from the National Institute on Drug Abuse.
Role of the Sponsor: The National Institutes of Health did not contribute to the design and conduct of the study; collection, management, analysis, and interpretation of the data; preparation, review, or approval of the manuscript; or decision to submit the manuscript for publication.
Additional Information: AHEAD study data are archived and available via the Interuniversity Consortium for Political and Social Research at www.icpsr.umich.edu/icpsrweb/NAHDAP/studies/33581.