Fig. 1

Treatment engagement during the 12-week Trial: (a) Treatment Retention, (b) number of counselling sessions, (c) average dose during weeks 2–12. Note: In (b) Error bars represent standard error of a percentage, \({\text{se}}_{\mathrm{\%}}= \sqrt{\frac{\mathrm{p}(1-\mathrm{p}}{\mathrm{n}}} \times 100\), where p = proportion of total sample who attended that number of sessions and n = count of people who attended that number of sessions. In (c) error bars represent standard error