Accepted for Publication: March 18, 2013.
Published Online: September 16, 2013. doi:10.1001/jamapediatrics.2013.2392.
Acquisition of data: Schulenberg, O’Malley, Johnston.
Analysis and interpretation of data: Patrick, Maggs, O’Malley, Johnston.
Drafting of the manuscript: Patrick, Martz.
Critical revision of the manuscript for important intellectual content: All authors.
Statistical analysis: Patrick, Martz, O’Malley.
Obtained funding: Schulenberg, O’Malley, Johnston.
Study supervision: Patrick, Johnston.
Conflict of Interest Disclosures: None reported.
Funding/Support: Data collection and work on this study were funded by grant R01 DA 01411 from the National Institute on Drug Abuse.
Disclaimer: The content herein is solely the responsibility of the authors and does not necessarily represent the official views of the sponsors.
Additional Contributions: Adam J. Burke, MA, assisted with the data analysis.
Correction: This article was corrected online October 21, 2013, for the omission of alphabet superscripts in the body of Table 1.