BackgroundDepression is a highly prevalent disorder, causing a large burden of
disease and substantial economic costs. Web-based self-help interventions
seem promising in promoting mental health.AimsTo compare the efficacy of a guided web-based intervention based on
acceptance and commitment therapy (ACT) with an active control
(expressive writing) and a waiting-list control condition (Netherlands
Trial Register NTR1296).MethodAdults with depressive symptoms from the general population were
randomised to ACT (n = 82), expressive writing
(n = 67) or waiting-list control (n
= 87). The main outcome was reduction in depressive symptoms assessed
with the Center for Epidemiological Studies – Depression scale.ResultsSignificant reductions in depressive symptoms were found following the
ACT intervention, compared with the control group (Cohen's
d = 0.56) and the expressive writing intervention
(d = 0.36). The effects were sustained at 6-month and
12-month follow-up.ConclusionsAcceptance and commitment therapy as a web-based public mental health
intervention for adults with depressive symptoms can be effective and
applicable.