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Risk ratio in treatment response (a) (≥50% reduction in Hamilton Depression Rating Scale/Montgomery–Åsberg Depression Rating Scale score) and remission (b) between non-ketamine N-methyl-D-aspartate receptor (NMDAR) antagonist-treated and placebo (PBO) control subjects in the articles analysed. Squares are effect sizes of single studies, diamonds of pooled results. CI, Confidence interval.
