Document is current

Article History

Received: 7 October 2020

Accepted: 26 October 2021

First Online: 24 November 2021

Declarations

:

: The participants were drawn from the National Population Registry and invited through a letter. The letter specified how data should be used, including for research. Consent was given upon participation in the survey. Participants who replied by telephone were informed about the study and gave their oral consent, participants who mailed in the questionnaire were informed about the conditions of consent in writing and consented by mailing in the questionnaire, and participants who participated online were also informed in writing and consented by replying to the online questionnaire.

: This study was conducted under license from the Norwegian Data Protection Authority; ref. 14/01453–3/GRA. A Data Protection Impact Assessment was conducted at the Norwegian Institute of Public Health in 2019; ref. 19/10156. Permission to merge survey data with national registry data was obtained from relevant data owners; Statistics Norway, the Norwegian labour and Welfare Administration (NAV) and the Norwegian Tax Administration.Because the dataset was conducted without personal identifiable information, specific ethical approval was not required for this study and the requirement for any such approval was waived by the Norwegian Data Protection Authority. We conducted the analyses in accordance with the Norwegian Data Protection Authority data protection regulations including the Data Protection Impact Assessment (DPIA).

: None.