Table 2.

Prognostic accuracy of NEWS2 and Liang’s COVID-19 score for severe COVID-19 using the optimal threshold values individuated by Youden index (N = 121)

(95% CI)	NEWS2 ≥ 4	COVID-GRAM (Liang) ≥ 123.2
Sensitivity, %	86.0 (73.3–94.2)	88.0 (76.2–94.4)
Specificity, %	70.4 (58.4–80.7)	62.0 (50.3–72.4)
Positive likelihood ratio	2.9 (2.0–4.2)	2.3 (1.7–3.2)
Negative likelihood ratio	0.2 (0.1–0.4)	0.2 (0.1–0.4)
Positive predictive value, %	67.2 (58.4–74.9)	62.9 (55.1–70.0)
Negative predictive value, %	87.7 (78.0–93.5)	88.2 (77.6–94.2)
Accuracy, %	76.9 (68.3–84.0)	72.7 (63.9–80.4)

NEWS national early warning score; COVID-19 Coronavirus Disease 19; CI confidence interval