The HUNT4 Survey collected data and samples between 2017-2019. 56.044 people from Nord-Trøndelag County participated, and for the first time the inhabitants of Sør-Trøndelag County were invited to answer a questionnaire in 2019.

As the counties of Nord- and Sør-Trøndelag merged in 2018, the study is now known as The Trøndelag Health Study.