Accepted for Publication: December 13, 2012.
Published Online: June 17, 2013. doi:10.1001/jamapediatrics.2013.75.
Study concept and design: Njoroge, Elenbaas, Garrison, Christakis.
Acquisition of data: Elenbaas, Garrison, Christakis.
Analysis and interpretation of data: All authors.
Drafting of the manuscript: Njoroge, Elenbaas.
Critical revision of the manuscript for important intellectual content: All authors.
Statistical analysis: Garrison, Myaing, Christakis.
Obtained funding: Njoroge, Christakis.
Administrative, technical, and material support: Elenbaas.
Study supervision: Garrison.
Conflict of Interest Disclosures: None reported.
Funding/Support: This study was supported by grant 1R01HD056506-01A2 from the Eunice Kennedy Shriver National Institute of Child Health and Human Development (NICHD) (Dr Christakis) and grant R01 HD 56506 from NICHD Research Supplements to Promote Diversity in Health-Related Research, PA-08-190, Media Impact on Preschool Behavior (Dr Njoroge).