Table 4.

Sensitivity, specificity, positive predictive value, negative predictive value, and accuracy of high COVID-GRAM scores and CURB-65 scores ≥2 in predicting critical illness and 30-day mortality in 523 patients hospitalized with COVID-19.

	(TP/total positives)	(TN/total negatives)	Sensitivity (%)	Specificity (%)	PPV (%)	NPV (%)
			(95% CI)	(95% CI)	(95% CI)	(95% CI)
Critical illness
High COVID-GRAM score	59/122	51/401	0.53 (0.44–0.62)	0.84 (0.81–0.88)	0.48 (0.39–0.57)	0.87 (0.84–0.91)
CURB-65 score ≥2	71/197	39/326	0.64 (0.55–0.73)	0.69 (0.65–0.73)	0.36 (0.29–0.43)	0.88 (0.85–0.92)
30-day mortality
High COVID-GRAM score	56/122	385/401	0.77 (0.68–0.87)	0.85 (0.82–0.88)	0.46 (0.37–0.55)	0.96 (0.94–0.98)
CURB-65 score ≥2	62/197	10/316	0.86 (0.78– 0.94)	0.70 (0.64–0.75)	0.31 (0.25–0.38)	0.97 (0.95–0.99)

CI, confidence interval; NPV, negative predictive value; PPV, positive predictive value; TN, true negative; TP, true positive.