. 2018 Apr 17;125(8):991–1000. doi: 10.1111/1471-0528.15205

Table 1.

Diagnostic accuracy of the alert line and the action line for severe adverse birth outcomes (n = 8603)

Clinical signs		Severe adverse birth outcomes		Sensitivity (95% CI)	Specificity (95% CI)	Positive likelihood ratio (95% CI)	Negative likelihood ratio (95% CI)	Diagnostic odds ratio (95% CI)	J statistic (Youden's index) (95% CI)
Clinical signs		Present	Absent	Sensitivity (95% CI)	Specificity (95% CI)	Positive likelihood ratio (95% CI)	Negative likelihood ratio (95% CI)	Diagnostic odds ratio (95% CI)	J statistic (Youden's index) (95% CI)
Alert line	Crossed	110	4053	56.7% (49.7–63.5)	51.1% (50.1–52.2%)	1.16 (1.02–1.32)	0.85 (0.72–1.00)	1.37 (1.03–1.83)	7.8% (0.8–14.9)
Alert line	Not crossed	84	4242	56.7% (49.7–63.5)	51.1% (50.1–52.2%)	1.16 (1.02–1.32)	0.85 (0.72–1.00)	1.37 (1.03–1.83)	7.8% (0.8–14.9)
Action line	Crossed	38	1230	19.6% (14.6–25.7)	85.2% (84.4–85.9)	1.32 (0.99–1.77)	0.94 (0.88–1.01)	1.40 (0.98–2.01)	4.8% (–0.9 to 10.4)
Action line	Not crossed	156	7065	19.6% (14.6–25.7)	85.2% (84.4–85.9)	1.32 (0.99–1.77)	0.94 (0.88–1.01)	1.40 (0.98–2.01)	4.8% (–0.9 to 10.4)