Submitted for Publication: July 11, 2013; final revision received October 4, 2013; accepted November 8, 2013.
Published Online: February 26, 2014. doi:10.1001/jamapsychiatry.2013.4525.
Study concept and design: D’Onofrio, Kuja-Halkola, Almqvist, Larsson, Lichtenstein.
Acquisition of data: Almqvist, Lichtenstein.
Analysis and interpretation of data: D’Onofrio, Rickert, Frans, Kuja-Halkola, Sjölander, Larsson.
Drafting of the manuscript: D’Onofrio, Rickert.
Critical revision of the manuscript for important intellectual content: D’Onofrio, Rickert, Frans, Kuja-Halkola, Almqvist, Sjölander, Larsson, Lichtenstein.
Statistical analysis: Rickert, Kuja-Halkola, Lichtenstein.
Obtained funding: D’Onofrio, Almqvist, Lichtenstein.
Administrative, technical, or material support: Frans, Kuja-Halkola, Almqvist, Sjölander, Larsson, Lichtenstein.
Study supervision: D’Onofrio.
Conflict of Interest Disclosures: None reported.
Funding/Support: The manuscript was supported by grant HD061817 from the National Institute of Child Health and Human Development (Drs D’Onofrio and Lichtenstein), the Swedish Research Council (Medicine) (Dr Lichtenstein), and the Swedish Council for Working Life and Social Research (Dr Lichtenstein).
Role of the Sponsors: The funding agencies provided support for merging the registries, database management, analyses, and manuscript preparation.
Previous Presentation: Preliminary results for autism were presented at the 2013 Society for Research in Child Development Conference; April 20, 2013; Seattle, Washington.
Correction: This article was corrected for an error in the Figure on February 26, 2014.