Table 2

Summary of ROC analysis for existing triage tools predicting adverse outcomes

Triage tool	n	C-statistic	Cut point	Sensitivity (95% CI)	Specificity (95% CI)	Positive predictive value (95% CI)	Negative predictive value (95% CI)	Proportion test positive
CURB-65	20 716	0.75 (0.74, 0.76)	(>1)	0.71 (0.70 to 0.72)	0.69 (0.69 to 0.70)	0.40 (0.39 to 0.41)	0.89 (0.89 to 0.90)	0.39
CRB-65	20 716	0.70 (0.69, 0.70)	(>0)	0.86 (0.85 to 0.87)	0.48 (0.47 to 0.48)	0.32 (0.31 to 0.33)	0.92 (0.92 to 0.93)	0.60
PMEWS	20 492	0.77 (0.76, 0.77)	(>2)	0.97 (0.96 to 0.97)	0.30 (0.30 to 0.31)	0.28 (0.27 to 0.29)	0.97 (0.96 to 0.97)	0.76
NEWS2 (score)	20 594	0.77 (0.76, 0.78)	(>4)	0.77 (0.76 to 0.78)	0.64 (0.63 to 0.65)	0.38 (0.37 to 0.39)	0.90 (0.90 to 0.91)	0.45
NEWS2 (rule)	20 594	0.69 (0.68, 0.69)	(>0)	0.83 (0.82 to 0.84)	0.55 (0.54 to 0.55)	0.34 (0.33 to 0.35)	0.92 (0.91 to 0.92)	0.54
SFAHP (6-point rule)	19 858	0.70 (0.69, 0.71)	(>0)	0.74 (0.73 to 0.75)	0.66 (0.65 to 0.67)	0.38 (0.37 to 0.39)	0.90 (0.89 to 0.90)	0.43
SFAHP (7-point rule)	20 682	0.68 (0.68, 0.69)	(>0)	0.88 (0.87 to 0.89)	0.48 (0.48 to 0.49)	0.33 (0.32 to 0.33)	0.94 (0.93 to 0.94)	0.60
WHO algorithm	20 891	0.61 (0.61, 0.62)	(>0)	0.95 (0.95 to 0.96)	0.27 (0.26 to 0.28)	0.27 (0.26 to 0.28)	0.95 (0.95 to 0.96)	0.78

NEWS2, National Early Warning Score version 2; PMEWS, Pandemic Modified Early Warning Score; ROC, receiver operating characteristic; SFAHP, swine flu adult hospital pathway.