Table 2.

Discriminative values of ABC-16 and ABC-6 scales

	ABC-16 scale	ABC-6
Cutoff score	≤ 70	≤ 65
Area under the curve (95% CI)	0.85 (0.79–0.91)	0.84 (0.77–0.89)
Youden index J	0.58	0.56
Sensitivity (95% CI), %	71.67 (58.6–82.5)	76.67 (64.0–86.6)
Specificity (95% CI), %	86.46 (78.0–92.6)	79.17 (69.7–86.8)
Positive likelihood ratio (95% CI)	5.29 (3.1–9.0)	3.68 (2.4–5.6)
Negative likelihood ratio (95% CI)	0.33 (0.2–0.5)	0.29 (0.2–0.5)
Positive predictive value (95% CI), %	76.79 (66.07–84.89)	69.70 (60.32–77.68)
Negative predictive value (95% CI), %	83.00 (76.41–88.04)	84.44 (77.24–89.68)
Test accuracy (95% CI), %	80.77 (73.70–86.63)	78.21 (70.90–84.41)
False-positive rate, %	13.54	23.33
False-negative rate, %	28.33	20.83

CI confidence interval