Morita Therapy for depression (Morita Trial): a pilot randomised controlled trial

Objective To address uncertainties prior to conducting a fully powered randomised controlled trial of Morita Therapy plus treatment as usual (TAU) versus TAU alone, or to determine that such a trial is not appropriate and/or feasible. Design Pilot parallel group randomised controlled feasibility trial. Setting and participants Participants aged 18 years with Diagnostic and Statistical Manual of Mental Disorders (DSM)-IV major depressive disorder, with or without DSM-IV anxiety disorder(s), recruited from general practice record searches in Devon, UK. Interventions We randomised participants on a 1:1 basis stratified by symptom severity, concealing allocation using a secure independent web-based system, to receive TAU (control) or 8-12 sessions of Morita Therapy, a Japanese psychological therapy, plus TAU (intervention). Outcomes Rates of recruitment, retention and treatment adherence; variance and estimated between-group differences in follow-up scores (on the Patient Health Questionnaire 9 (PHQ-9) (depressive symptoms); Generalised Anxiety Disorder Questionnaire 7 (anxiety symptoms); Short Form 36 Health Survey Questionnaire/Work and Social Adjustment Scale (quality of life); Morita Attitudinal Scale for Arugamama (attitudes)) and their correlation with baseline scores. Results We recruited 68 participants, 5.1% (95% CI 3.4% to 6.6%) of those invited (34 control; 34 intervention); 64/68 (94%; 95% CI 88.3% to 99.7%) provided 4-month follow-up data. Participants had a mean age of 49 years and mean PHQ-9 score of 16.8; 61% were female. Twenty-four of 34 (70.6%) adhered to the minimum treatment dose. The follow-up PHQ-9 (future primary outcome measure) pooled SD was 6.4 (95% CI 5.5 to 7.8); the magnitude of correlation between baseline and follow-up PHQ-9 scores was 0.42 (95% CI 0.19 to 0.61). Of the participants, 66.7% and 30.0% recovered in the intervention and control groups, respectively; 66.7% and 13.3% responded to treatment in the intervention and control groups, respectively. Conclusions A large-scale trial of Morita Therapy would require 133 participants per group and is feasible with minor modifications to the pilot trial protocol. Morita Therapy shows promise in treating depression and may provide patients with a distinct alternative to current treatments. Trial registration number ISRCTN17544090; Pre-results.