Author Contributions: Drs Einfeld and Tonge had full access to all of the data in the study and take responsibility for the integrity of the data. Drs Piccinin, Hofer, Hoffman, and Mackinnon, and Mr Bontempo take responsibility for the accuracy of the data analysis.
Study concept and design: Einfeld, Piccinin, Mackinnon, Hofer, Bontempo, Parmenter, Tonge.
Acquisition of data: Einfeld, Gray, Tonge.
Analysis and interpretation of data: Einfeld, Piccinin, Mackinnon, Hofer, Taffe, Gray, Bontempo, Hoffman, Parmenter, Tonge.
Drafting of the manuscript: Einfeld, Piccinin, Mackinnon, Hofer, Taffe, Gray, Hoffman, Tonge.
Critical revision of the manuscript for important intellectual content: Einfeld, Piccinin, Mackinnon, Hofer, Taffe, Bontempo, Parmenter, Tonge.
Statistical analysis: Piccinin, Mackinnon, Hofer, Taffe, Bontempo, Hoffman.
Obtained funding: Einfeld, Hofer, Gray, Parmenter, Tonge.
Administrative, technical, or material support: Einfeld, Hofer, Parmenter, Tonge.
Study supervision: Einfeld, Tonge.
Financial Disclosures: Drs Einfeld and Tonge hold the copyright for the Developmental Behaviour Checklist but derive no personal or financial benefit from its sale. No other authors reported any financial disclosures.
Funding/Support: The Australian Child to Adult Development Study was supported by grant 113844 from the National Health and Medical Research Council, Australia (Drs Einfeld, Tonge, and Parmenter), and grant MH61809-02 from the National Institute of Mental Health (Dr Tonge).
Role of the Sponsors: The funding sponsors had no role in the design and conduct of the study, in the collection, management, analysis, and interpretation of the data, or in the preparation, review, or approval of the manuscript.
Additional Information: A full listing of staff who contributed to this project is available at http://www.med.monash.edu.au/psychmed/units/devpsych/acad.html.
Acknowledgment: We thank the families who granted us the privilege of being a part of their lives for the past 14 years.