Table 5.

Triage tool diagnostic accuracy statistics (95% CI) for predicting ICU admission (entire study period)

Tool	N*	C-statistic	Threshold	N (%) above threshold	Sensitivity	Specificity	PPV	NPV
CRB-65	432 580	0.57 (0.57, 0.58)	>0	102 964 (23.8%)	0.38 (0.36, 0.40)	0.76 (0.76, 0.76)	0.008 (0.007, 0.009)	0.996 (0.996 0.996)
NEWS2	433 079	0.72 (0.70, 0.73)	>1	258 643 (59.7)	0.85 (0.83, 0.86)	0.40 (0.40, 0.41)	0.007 (0.007, 0.007)	0.993 (0.993, 0.993)
PMEWS	438 806	0.71 (0.70, 0.72)	>2	202 335 (46.1%)	0.76 (0.75, 0.78)	0.54 (0.54, 0.54)	0.008 (0.008, 0.009)	0.998 (0.997, 0.998)
PRIEST	438 876	0.71 (0.70, 0.71)	>4	163 649 (37.3%)	0.67 (0.65, 0.69	0.63 (0.63, 0.63)	0.009 (0.008, 0.009)	0.997 (0.997, 0.998)
WHO	437 850	0.63 (0.61, 0.64)	>0	253 355 (57.9%)	0.77 (0.75, 0.79)	0.42 (0.42, 0.42)	0.007 (0.006, 0.007)	0.997 (0.997, 0.998)
TEWS	432 606	0.66 (0.65, 0.67)	>2	237 482 (54.9%)	0.75 (0.73, 0.77)	0.45 (0.45, 0.45)	0.007 (0.006, 0.007)	0.997 (0.997, 0.997)
Quick COVID	446 084	0.66 (0.65, 0.66)	>3	36 634 (8.2%)	0.30 (0.28, 0.32)	0.92 (0.92, 0.92)	0.02 (0.02, 0.02)	0.996 (0.996, 0.996)

*Patients with <3 parameters were excluded from analysis when estimating performance.

CRB-65, Confusion Respiratory Rate Blood Pressure Age≥65; ICU, intensive care unit; NEWS2, National Early Warning Score, version 2; PMEWS, Pandemic Medical Early Warning Score; PRIEST, Pandemic Respiratory Infection Emergency System Triage; TEWS, Triage Early Warning Score.