Therapist manual adherence
All MC sessions were videotaped, and manual adherence was coded on a random sample of 20% of the tapes by two independent raters following the procedure of Trillingsgaard et al. (The average adherence rating was 4.77 (range from 3.88 to 5.00), indicating that therapists overall adhered to the MC manual. The interrater reliability was good as coders agreed within one level of the scale in 89.3% of their ratings.