Author Contributions:Study concept and design: Terry-McElrath and Johnston. Acquisition of data: Johnston. Analysis and interpretation of data: Terry-McElrath, Johnston, and O’Malley. Drafting of the manuscript: Terry-McElrath. Critical revision of the manuscript for important intellectual content: Terry-McElrath, Johnston, and O’Malley. Statistical analysis: Terry-McElrath and O’Malley. Obtained funding: Johnston. Study supervision: Johnston.
Financial Disclosure: None reported.
Funding/Support: Research support was provided by the Robert Wood Johnson Foundation to the Youth, Education, and Society study, a part of the foundation's Bridging the Gap initiative.