PS227. Psychometric Properties of the Korean Version of the Clinically Useful Depression Outcome Scale (CUDOS) in Psychiatric Outpatients

s | 83 included) and Mantel Haenszel-Risk Ratio of 1.31, 95% CI=1.01 to 1.69 (p=0.04) favouring active treatment over placebo according to response rates (12 studies included). Trials were patients merely had BLT as active treatment indicated a higher effect size (Hedges`s g= -0.51, 95%CI =-0.70 to -0.32 and p=0.001) than studies with concomitant psychopharmacological treatment (Hedges`s g= -0.18, 95% CI= -0.41 to 0.06, p=0.15). Conclusion: According to our findings, bright light therapy can be regarded as an effective treatment in seasonal affective disorder compared with placebo conditions.