Table 3.

Predictive characteristics of ‘optimal cut-points’ of umbilical venous and arterial lactate predicting composite neonatal morbidity (N=7,741)

Characteristic	Venous lactate	Arterial Lactate	P
Optimal cut-point	3.4 mmol/L	3.9 mmol/L
Sensitivity (95% CI)	75.0 (65.3, 83.1)	74.0 (64.3, 82.3)	>0.99
Specificity (95% CI)	69.7 (68.6, 70.7)	72.2 (71.2, 73.2)	<0.01
Positive predictive value (95% CI)	3.1 (2.5, 3.9)	2.9 (2.7, 4.2)	–
Negative predictive value (95% CI)	99.8 (99.5, 99.9)	99.6 (99.3, 99.8)	–
Positive likelihood ratio (95% CI)	2.5 (2.2, 2.8)	2.7 (2.4, 3.0)	–
Negative likelihood ratio (95% CI)	0.4 (0.3, 0.50)	0.4 (0.3, 0.5)	–