Table 1 Characteristics of Trials Included in the Meta-Analysis of the Efficacy of Omega-3 Fatty Acids for DepressionAll 13 trials included in this meta-analysis were randomized, double-blind and placebo-controlled. All trials were additionally conducted in an outpatient setting relying on referred volunteers. For classification of trials by baseline depression severity we used traditional cutoffs for the HDRS-17 (mild: <18, moderate: 18-28, severe: >28) 19. Trials that measured depression severity on scales other than the HDRS-17 were converted to this scale based on previously defined algorithms 20. Abbreviations: EPA= eicosapentaenoic acid, DHA=docosahexaenoic acid,, EPA/DHA=Ratio of EPA to DHA,QRS=Quality Rating Scale, PD=Parkinson Disease, HAM-D=Hamilton Rating Scale for Depression, BDI=Beck Depression Inventory, MADRS= Montgomery Åsberg Depression Rating Scale, ITT=intention-to-treat analysis, modified ITT=ITT analysis where subjects were required to either take one medication dose or make one follow-up visit to be included in the analysis, + = positive study which showed a benefit of omega-3 fatty acids compared to placebo, and - =negative study which failed to show benefit of omega-3 FA.
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