Study design
WL, pain
Patients were randomly assigned to one of three conditions: (1) A specific mindfulness- and acceptance-based PI called “Mind Your ENDOmetriosis” (MY-ENDO), (2) A non-specific PI (Non-specific) that matched MY-ENDO in non-specific factors such as empathy, the therapeutic alliance, a cogent rationale, and expectations of improvement, but did not include the assumed specific ingredient, mindfulness or (3) A WL that involved treatment, as usual, to control for the natural fluctuations in pain [The study was preregistered with The Danish Data Protection Agency (journal no. 2015-57-0002), approved by The Central Denmark Region Committees on Health Research Ethics (registration no. 1-10-72-138-15), and retrospectively registered at clinicaltrials.gov (NCT02761382). Data was collected from March 2016 to October 2018.