Results
In total, 600 people were assessed for eligibility. Of 410 randomized participants, 255 (62.2%) were female, and the median (IQR) age was 32 (25-45) years. Of the 410 participants, 204 were allocated to MBCT-SH and 206 to CBT-SH between November 24, 2017, and January 31, 2020, with final follow-up on December 15, 2020. A total of 17 participants (4.1%) were Asian or Asian British; 15 (3.7%) were Black, African, Caribbean, or Black British; 20 (4.9%) were mixed/multiple ethnic groups; 351 (85.6%) were White British or White Irish; 5 (1.2%) were other ethnic groups; and 2 (0.5%) preferred not to say. Primary outcome data were available for 155 of 204 MBCT-SH participants (76.0%) and 154 of 206 CBT-SH participants (74.8%). At 42 weeks, 146 MBCT-SH participants (71.6%) and 149 CBT-SH participants (72.3%) provided data. See 