The unit of analysis is the couple, meaning that each line corresponds to a couple. However, some specifications should be considered: Wave 1 - couple (both partners were interviewed) Wave 2 - couple (only the female partner from the original couple of wave 1 was interviewed) Wave 3 - couple (several situations: both partners of the original couple, only one partner of the original couple, new partner of the original couple, both partners from the cohort refreshment in wave 3)

Wave 1 - Random stratified sampling by region (oversampling of French and Italian-speaking parts) Wave 2 - Female partners from the original couple (wave 1) Wave 3 - Respondents from wave 1 (in couple or alone), new partners and cohort refreshement (randomly selected)

See the attached documents.