Figure 2From: Evaluation of host and viral factors associated with severe dengue based on the 2009 WHO classificationSensitivity (S) and specificity (E) of platelet count for prediction of severe dengue. Several intersection (cut-off) points were selected and S and E calculated for each. On the coordinates (abscissas) axis (1-E) and S on the ordinates axis. The ideal examination (S = 1 and E = 1) should be on the top-left angle of the graph. Cut-off value of 35,000 plat/μ L showed the greatest sensitivity and specificity (S = 75% and E = 72.86%). A cut-off value of 100,000 plat/μ L showed S of 97.25% and E of 37%. (N = 389, area under the curve ROC = 0.8199).Back to article page