Table 5.

Score characteristics for transfusion by varying score cut-offs.

Cut-off of score	Sensitivity (95% CI), %	Specificity (95% CI), %	PPV (95% CI), %	NPV (95% CI), %	LR+ (95% CI)	LR– (95% CI)
≥1	91.1 (88.5–93.2)	40.0 (40.0–40.0)	13.2 (12.8–13.5)	97.8 (97.2–98.3)	1.52 (1.47–1.56)	0.22 (0.17–0.29)
≥2	54.4 (50.6–58.2)	85.0 (84.6–85.4)	26.6 (24.7–28.5)	94.9 (94.5–95.3)	3.63 (3.29–3.98)	0.54 (0.49–0.58)
≥3	20.9 (18.5–23.2)	98.5 (98.3–98.7)	58.5 (51.9–64.9)	92.6 (92.4–92.8)	14.1 (10.8–18.5)	0.80 (0.78–0.83)
4	4.6 (3.8–5.0)	99.9 (99.9–1.00)	89.3 (72.9–96.3)	91.3 (91.2–91.3)	83.4 (26.9–259.3)	0.95 (0.95–0.96)