Fig. 2

Summary receiver operating characteristics (SROC) curve of the cuff leak test for predicting post-extubation upper airway obstruction. The circle size represents the number of extubation in each study. The pooled sensitivity is 0.62 (95% CI 0.49–0.73) and the pooled specificity is 0.87 (95% CI 0.82–0.90), with the area under the SROC curve of 0.85 (95% CI 0.82–0.88). The prediction region illustrates the extent of statistical heterogeneity by depicting a region within there is 95% confidence that the true sensitivity and specificity of a future study should lie