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Article History

Received: 4 March 2018

Accepted: 13 January 2020

First Online: 30 January 2020

Ethics approval and consent to participate

: In the main study the Regional Committee approved each follow-up examination for Medical and Health Research Ethics (REC) in Central Norway. For the examination at 19 years of age, providing the data in the present study, written informed consent was collected from all participants prior to participation in line with the approval for this specific follow-up examination (REC project number 4.2005.2605). At recruitment, all potential participants were considered competent to understand the information and to sign the informed consent form. For the examination at 15 years (socioeconomic status), written informed consent was obtained from both adolescents and their parents, and at each of the earlier follow up examinations (at birth, at one and 6 years of age) written informed consent was obtained from the parents. All participants were offered neuropsychological feedback to discuss the results of their cognitive assessment, and if an undiagnosed mental disorder was suspected, or in case of unmet health needs, the participants were offered referral to the appropriate health services.

: Not applicable.

: The authors declare that they have no competing interests.