Author Contributions: Drs Roth and Magnus had full access to all the data in this study and take responsibility for the integrity of the data and the accuracy of the data analysis. Dr Schjølberg takes responsibility for the integrity of the clinical data.
Study concept and design: Roth, Magnus, Stoltenberg, Reichborn-Kjennerud, Susser.
Acquisition of data: Roth, Magnus, Schjølberg, Stoltenberg, Surén, Reichborn-Kjennerud.
Analysis and interpretation of data: Roth, Magnus, Schjølberg, Surén, McKeague, Davey Smith, Susser.
Drafting of the manuscript: Roth, Magnus, Susser.
Critical revision of the manuscript for important intellectual content: Roth, Magnus, Schjølberg, Stoltenberg, Surén, McKeague, Davey Smith, Reichborn-Kjennerud, Susser.
Statistical analysis: Roth, Magnus, Surén, McKeague, Susser.
Obtained funding: Roth, Magnus, Stoltenberg, Reichborn-Kjennerud, Susser.
Administrative, technical or material support: Roth, Magnus, Stoltenberg, Reichborn-Kjennerud, Susser.
Study supervision: Magnus, Schjølberg, Stoltenberg, Davey Smith, Reichborn-Kjennerud, Susser.
Conflict of Interest Disclosures: All authors have completed and submitted the ICMJE Form for Disclosure of Potential Conflicts of Interest and none were reported.
Funding/Support: This work was supported by the Norwegian Ministry of Health and the Ministry of Education and Research, and grants N01-ES-85433 from the National Institutes of Health/National Institute of Environmental Health Sciences, 1 UO1 NS 047537-01 from the National Institutes of Health/National Institute of Neurological Disorders and Stroke, and 151918/S10 from the Norwegian Research Council/FUGE (Funksjonell genomforskning). Dr Susser was supported in part by a National Alliance for Research on Schizophrenia and Depression distinguished investigator award. Dr Roth was supported by grant 181847/V50 from the Norwegian Research Council and by a travel grant from the American Women's Club of Oslo.
Role of the Sponsors: The above-mentioned funding agencies were not responsible for the design and conduct of the study, for the collection, management, analysis, and interpretation of the data; or in the preparation, review, or approval of the manuscript.
Additional Contributions: Caroline Relton, PhD (Institute of Genetic Medicine, Newcastle University), provided critical comments to the manuscript and Eivind Ystrøm, PhD (Department of Adult Mental Health, Norwegian Institute of Public Health), provided assistance with the breastfeeding data. Neither received any compensation from a funding sponsor for their contributions. The donations of questionnaire data and biological material from MoBa participants are gratefully acknowledged. We thank investigators at Columbia University, the National Institute of Neurological Disorders and Stroke, and the Norwegian Institute of Public Health for access to data from the Autism Birth Cohort Study (NS-U01NS047537).