Motivational interviewing (MI) showed no clear difference in retention ‐ end of treatment compared with treatment (low certainty).
Brief motivational interviewing (BMI) showed no clear difference in retention ‐ end of treatment compared with assessment‐only to reduce alcohol consumption (moderate certainty).
Motivational interviewing intensive (MII) may leads to higher retention ‐ end of treatment compared with motivational interviewing (MI) to reduce alcohol consumption (low certainty).
It is very uncertain whether cognitive‐behavioural coping skills training (CBCST) changes retention ‐ end of treatment compared with twelve‐step facilitation (TSF) programme to reduce alcohol consumption (very low certainty).
Supervised dosing with a long‐acting medication showed no clear difference in retention ‐ retention at the end of treatment (number of participants) compared with unsupervised consumption (low certainty).