Submitted for Publication: April 7, 2013; final revision received September 20, 2013; accepted September 20, 2013.
Published Online: January 22, 2014. doi:10.1001/jamapsychiatry.2013.3893.
Study concept and design: Maenner, Rice, Schieve, Carpenter, Kirby, Durkin.
Acquisition of data: Maenner, Rice, Arneson, Cunniff, Schieve, Carpenter, Van Naarden Braun, Bakian, Durkin.
Analysis and interpretation of data: Maenner, Rice, Cunniff, Schieve, Van Naarden Braun, Kirby, Durkin.
Drafting of the manuscript: Maenner, Rice, Schieve, Durkin.
Critical revision of the manuscript for important intellectual content: All authors.
Statistical analysis: Maenner, Schieve, Kirby.
Obtained funding: Maenner, Cunniff, Carpenter, Bakian, Durkin.
Administrative, technical, and material support: Rice, Arneson, Carpenter, Van Naarden Braun, Bakian, Durkin.
Study supervision: Rice, Cunniff, Durkin.
Conflict of Interest Disclosures: None reported.
Funding/Support: This work was supported by a grant from the Autism Science Foundation and by the Centers for Disease Control and Prevention Cooperative Agreements UR3/CCU523235, UR3/DD000078, and UR3/DD000677. Additional support was from National Institute of Child Health and Human Development grant T32 HD007489-04 and the Waisman Center (grant P30 HD03352).
Role of the Sponsor: The Centers for Disease Control and Prevention funds and administers the Autism and Developmental Disabilities Monitoring Network and co-authors working at the Centers for Disease Control and Prevention made contributions to this article. The other funders had no role in the design and conduct of the study; collection, management, analysis, or interpretation of the data; preparation, review, or approval of the manuscript; and decision to submit the manuscript for publication.
Disclaimer: The findings and conclusions in this article are those of the author(s) and do not necessarily represent the official position of the Centers for Disease Control and Prevention.
Additional Contributions: We are grateful to the many staff, scientists, and clinicians who have contributed to the Autism and Developmental Disabilities Monitoring Network project.
Correction: This article was corrected online February 5, 2014, for a typographical error in Table 2.