Figure 4.

Forest plot for diagnostic odds ratio (DOR) of US (left) and CXR (right). DOR = positive likelihood ratio/negative likelihood ratio = TP × TN/FN × FP. Inconsistency (I²) describes the percentage heterogeneity across studies that is not due to chance. Tau-squared represents the amount of heterogeneity. Cochran Q is a statistic that represents a ratio of total observed variation to within-study error; it is usually computed by summing the squared deviations of each study’s estimate from the overall meta-analytic estimate.