Figure 4From: The effect of prone positioning on mortality in patients with acute respiratory distress syndrome: a meta-analysis of randomized controlled trialsMeta-analysis of the effect of prone positioning on 60-day mortality in acute respiratory distress syndrome patients with positive end-expiratory pressure ≥10 cmH 2 O. No obvious heterogeneity was found using the Mantel–Haenszel (M-H) χ2 test (P = 0.31) and the I2 test (I2 = 15%). A fixed-effects model was used. The z-test result for overall effects was statistically significant (P = 0.04). “Weight” is the contribution of each study to the overall risk ratio. CI, Confidence interval; I2, Percentage of total variation across studies from between-study heterogeneity rather than chance; PP, Prone positioning; SP, Supine positioning.Back to article page