Addition of SNAP to perinatal risk factors improves the prediction of bronchopulmonary dysplasia or death in critically ill preterm infants

Table 4 Predictive characteristics of SNAP and other risk factors for BPD or death

	Cut-off value	Sensitivity	Specificity	PPV	NPV	LR+	LR-
Gestational age	31 weeks	81%	73%	75%	79%	3.0	0.26
SNAP score	10.5	79%	71%	73%	77%	2.7	0.29
SNAP, combined with gestational age		84%	77%	79%	83%	3.8	0.20
Combination of 5 risk factors^a		77%	90%	88%	80%	7.4	0.25

BPD bronchopulmonary dysplasia, LR + likelihood ratio positive, LR- likelihood ratio negative, NPV negative predictive value, PPV positive predictive value, SNAP the score for neonatal acute physiology.
^aFive risk factors: gestational age, SNAP, surfactant use, apnea of prematurity, and patent ductus arteriosus.

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