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Article History

Accepted: 10 November 2024

First Online: 13 January 2025

Declarations

:

: Open access funding provided by Aarhus Universitet. This study was funded by Sygeforsikring ‘danmark’ (journalnr. 2021–0139). Partial financial support was also received from the National Institute of Mental Health (NIMH) (R01MH122869). The funding agency had no role in the design, data analyses, interpretation of results, writing the article or decision to submit the article for publication.

: H.L. reports receiving grants from Shire Pharmaceuticals; personal fees from and serving as a speaker for Medice, Shire/Takeda Pharmaceuticals and Evolan Pharma AB; and sponsorship for a conference on attention-deficit/hyperactivity disorder from Shire/Takeda Pharmaceuticals and Evolan Pharma AB, all outside the submitted work. H.L. is editor-in-chief of JCPP Advances. T.M.O. has received a speaker's fee from Lundbeck A/S within the last 3 years. S.K.S. has received speaker’s honoraria from Takeda, Medice Arzneitmittel Pütter GmbH and Co KG as well as Janssen in the past 3 years. K.B.M. has received a speaker’s fee from Medice Nordic within the last 3 years. All other authors have nothing to declare.

: The study was approved by the Danish Data Protection Agency and Statistics Denmark’s Scientific Board. Approval from the Ethics Committee was not required. All data have been deidentified and is not recognisable at an individual level.

: Informed consent is not required for register-based studies according to Danish law.

: Not applicable.

: Access to individual-level data from Denmark is governed by Danish authorities. These include the Danish Data Protection Agency, the Danish Health Data Authority, the Ethical Committee and Statistics Denmark. Each scientific project must be approved before initiation, and approval is granted to a specific Danish research institution. Researchers at Danish research institutions may obtain the relevant approval to access data. International researchers may gain data access if governed by a Danish research institution having approval and data access. Code can be made available upon reasonable request.

: M.G.M. and K.B.M. designed the study. M.G.M. analysed and wrote the first draft of the manuscript. J.Z. was responsible for data management and assisted with the analyses. K.B.M. assisted with and supervised all aspects of the article. All authors read and approved the final manuscript and agree to be accountable for the work.