Fig. 2
Forest plot of paired sensitivities and specificities of study algorithms ascertaining acute heart failure. Legend: Algorithms sorted by diagnostic code position. Summary points estimated using a bivariate random effects model. CI indicates confidence intervals; FN, false negatives; FP, false positives; I2, I2statistic describing the percentage of variation across studies that is due to heterogeneity rather than chance; TN, true negatives and TP, true positives