Article History
Received: 30 April 2021
Accepted: 30 June 2021
First Online: 16 July 2021
Compliance with Ethical Standards
:
: The authors declare no competing interests.
: Ethical approval for the 1970 British Cohort study and Next Steps study have been given by multiple UK research ethics boards and the UK Department of Education. URL for the 1970 British Cohort study: ExternalRef removed. URL for the Next Steps study: ExternalRef removed.
: Cohort members or their parents provided informed consent in written or verbal form in each of the waves of the 1970 British Cohort study and Next Steps study.