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BackgroundTo date no studies have explored the effectiveness of written cognitive–behavioural therapy (CBT) resources for low mood and stress delivered via a course of self-help classes in a community setting.AimsTo assess the effectiveness of an 8-week community-based CBT self-help group classes on symptoms of depression, anxiety and social function at 6 months (trial registration: ISRCTN86292664).MethodIn total, 142 participants were randomly allocated to immediate (n = 71) or delayed access to a low-intensity CBT intervention (n = 71). Measures of depression, anxiety and social function were collected at baseline and 6 months.ResultsThere was a significant improvement for the primary outcome of Patient Health Questionnaire-9 (PHQ-9) score (mean between-group difference: –3.64, 95% CI –6.06 to –1.23; P = 0.004). The percentage of participants reducing their PHQ-9 score between baseline and …