Table 4 Sensitivity, specificity, positive predictive value and negative predictive value for different cutoff point

≥ 12.8

94.6 (86.7 – 98.5)

23.3 (21.4 – 25.2)

4.5 (3.6–5.7)

99.1 (97.7 – 99.8)

≥ 13.4

83.8 (73.4 – 91.3)

51.2 (48.9 – 53.4)

6.2 (4.8 – 7.9)

98.8 (97.9 – 99.4)

≥ 14.3

70.3 (58.5 – 80.3)

75.3 (73.3 – 77.2)

9.9 (7.5 – 12.8)

98.5 (97.7 – 99.1)

≥ 14.5^a

67.6 (55.7 – 78.0)

79.0 (77.1 – 80.8)

11 (8.3 – 14.3)

98.4 (97.7 – 99.0)