Accepted for Publication: March 6, 2014.
Published Online: July 7, 2014. doi:10.1001/jamapediatrics.2014.472.
Study concept and design: Olds, Kitzman, Cole.
Acquisition, analysis, or interpretation of data: Kitzman, Knudtson, Anson, Smith, Cole.
Drafting of the manuscript: Olds, Kitzman.
Critical revision of the manuscript for important intellectual content: All authors.
Statistical analysis: Knudtson, Cole.
Obtained funding: Olds, Kitzman.
Administrative, technical, or material support: Kitzman, Anson, Smith.
Study supervision: Kitzman.
Conflict of Interest Disclosures: The Prevention Research Center for Family and Child Health, directed by Dr Olds at the University of Colorado School of Medicine, has a contract with the NFP to conduct research to improve the NFP program and its implementation. Dr Olds and Mr Knudtson were employed by this center at the time the study was conducted. Dr Olds is the founder of the NFP. No other disclosures are reported.
Funding/Support: The current phase of this research was supported with funding from the National Institute of Drug Abuse (grant 1R01DA021624).
Role of the Sponsor: The sponsor had no role in the design and conduct of the study; collection, management, analysis, and interpretation of the data; preparation, review, or approval of the manuscript; and decision to submit the manuscript for publication.
Additional Contributions: Cheryl Loston-Williams (University of Colorado) helped to prepare this manuscript, Wendy Gehring (University of Colorado) assisted with data management, and Jamie McGregor, MD (University of Colorado), provided comments on the analysis. Mss Loston-Williams and Gehring received compensation from research grants for their work.