CBT in primary care : effects on symptoms and sick leave, implementation of stepped care and predictors of outcome

Background: Common mental disorders (CMDs) cause great individual suffering and high societal costs including long-term sick leave. Cognitive behavioural therapy (CBT) can effectively treat CMDs, but access to treatment is insufficient. Moreover, sick leave is not reduced to the same extent as psychiatric symptoms after CBT. Little is known about predictors of outcome after CBT, especially concerning guided self-help. Aims: The aim of the present thesis was to systematically review the effects and evidence of psychological treatments on sick leave and assess the effects in a meta-analysis of published treatment trials (Study I), evaluate the effect of CBT and a novel return-to-work intervention (RTW-I) on sick leave and psychiatric symptoms for patients with CMDs (Study II), test a stepped care CBT model for CMDs in primary care (Study III), and investigate predictors of outcome for guided self-help CBT (Study IV). Methods: In Study I, a systematic review and meta-analysis (45 studies) was conducted regarding effects of psychological interventions on sick leave and symptoms. In Study II (N = 211) and III (N = 396) patients from four primary care centres in Stockholm were treated with disorder specific CBT for CMDs. In Study II, patients on sick leave were randomised to CBT, RTW-I, or a combination of the two, and were followed up one year after treatment regarding sick leave and symptoms. In Study III all patients received disorder specific guided self-help CBT for nine weeks. Non-responders were then randomised to face-to-face CBT or continued guided self-help. In Study IV predictors of outcome for guided self-help CBT in Study III were investigated. Results: Study I showed that psychological interventions were more effective than care as usual in reducing sick leave and psychiatric symptoms but the effect sizes were small (g = 0.15 and 0.20, respectively). There was no significant difference in effect between work focused interventions, problem solving therapy, CB