An Auckland based study recruited patients from the waiting room then randomised them to do a work/love/play questionnaire1 followed by behavioural activation (BA) or usual care.2
BA usually consisted of doing some exercise, contacting a friend for a social engagement and doing something pleasurable. Each activity had to reach a 7/10 likelihood of doing it (where 10 means absolutely will do it) to be considered a workable option.
The average baseline PHQ 8 was just under 12 (moderate depressive symptoms) and, after one week, 46% of participants were in remission, while in the control group, this was 21% - an NNT of 4.
A systematic review of trials for depression found an NNT for behavioural activation for depression is 2.5 measured a week to a month after the interventions.3 This suggests that BA is the most effective treatment for depression/depressive symptoms.