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Sustained effectiveness and cost-effectiveness of the Healthy Activity Programme, a brief psychological treatment for depression delivered by lay counsellors in primary care: 12-month follow-up of a randomised controlled trial

Fig 4

The mediating effect of behavioural activation at 3 months on the effectiveness of the HAP on depression severity at 12 months.

Variables as follows: β, Beta coefficient; a, a-path (HAP–mediator); b, b-path (mediator–outcome); c, direct effect (HAP–outcome); a × b, indirect effect. BDI-II, Beck Depression Inventory–II; PHQ-9, Patient Health Questionnaire 9.

Fig 4

doi: https://doi.org/10.1371/journal.pmed.1002385.g004