Figure 3.

Forest plot of the sensitivity and specificity estimates and 95% confidence intervals (CIs) stratified by study location. 7 studies generating 36 data points were conducted in developed countries (Subgroup W) and 19 studies generating 39 data points were conducted in developing countries (Subgroup E). Estimates of sensitivity and specificity from each study are shown as solid squares. Solid lines represent the 95% CIs. Squares are proportional to the weights based on the random effect model. Pooled estimates and 95% CIs is denoted by the diamond at the bottom. I² and p values represents heterogeneity of studies.