Table 2.

Number of patients requiring therapy; sensitivity, specificity, PPV and NPV with increasing GBS

GBS	Therapeutic intervention (n = 63)	Sensitivity	Specificity	PPV	NPV
0	0	100% (94.31–100)	18.45% (14.45–23.02)	18.69% (17.93–19.48)	100%
≤1	0	100% (94.31–100)	30.65% (25.77–35.89)	21.28% (20.12–22.50)	100%
≤2	2 (1.49%)	96.83% (89.00–99.61)	39.88% (34.61–45.34)	23.19% (21.50–24.98)	98.53% (94.45–99.62)
≤3	2 (1.24%)	96.83% (89.00–99.61)	47.92% (42.47–53.41)	25.85% (23.76–28.05)	98.77% (95.35–99.69)
≤4	6 (3.17%)	90.48% (80.41–96.42)	54.56% (48.97–59.88)	27.14% (24.43–30.03)	96.83% (93.40–98.50)
≤5	12 5.71%)	80.95% (69.09–89.75)	58.93% (53.46–64.24)	26.98% (23.67–30.57)	94.29% (90.78–96.51)
≤6	13 (5.83%)	79.37% (67.30–88.53)	62.5% (57.08–67.69)	28.41% (24.77–32.36)	94.17% (90.81–96.35)
≤7	19 (7.31%)	68.25% (55.31–79.42)	71.43% (66.27–76.20)	30.94% (26.08–36.25)	92.31% (89.25–94.55)
≤8	21 (7.45%)	65.08% (52.03–76.66)	77.38% (72.53–81.74)	35.04% (29.21–41.36)	92.2% (89.36–94.33)

GBS = Glasgow Blatchford score; NPV = negative predictive value; PPV = positive predictive value