“…Of the 8,904 patients from 22 studies used for the qualitative review, 4,560 patients were in the pre-intervention cohort and 4,251 patients in the post-intervention cohort. 10–32 Direct interventions to reduce opioid prescriptions were evaluated in 16 studies 11,12,14,15,18–21,25–29,31 (7,086 patients), while 6 studies 10,13,16,24,30,32 (1,818 patients) evaluated the effects of various indirect interventions. In 12 studies, 10,11,14,16,19,21,24–26,29,30,32 the procedures were categorized as major surgery, while 7 studies 12,13,18,20,22,23,27 included minor procedure and 3 studies 16,28,31 included both.…”