Table 4. Multivariate predictor for grade 3–4 intraventricular hemorrhage (IVH) on the basis of n = 149 IVH cases among 1742 datasets.

Variable		Regression coefficient	OR	95% CI	p value
Intercept		–5.8446
Gestational age <26 weeks		3.5218	33.844	16.735 – 68.443	<0.0001
	26–27	2.3550	10.538	5.154 – 21.545	<0.0001
	28–29	2.0245	7.572	3.746 – 15.304	<0.0001
	30–32 (reference)
P63 1-min Apgar <6		0.9572	2.604	1.737 – 3.904	<0.0001
N16 Early sepsis <3 days		0.9347	2.546	1.581 – 4.101	0.0001
P35.3 No pathological Doppler result		0.7966	2.218	1.142 – 4.309	0.0187
P44.2 Intrapartum tocolysis		0.6496	1.915	1.285 – 2.853	0.0014

Validation of this logistic regression model: p = 0.59 in Hosmer-Lemeshow test; area under the ROC: AUC = 0.877 (simple reclassification) or AUC = 0.861 (bootstrap cross-validation); Nagelkerke’s R2 = 0.44.

^*1 P(perinatal) and N (neonatal), data from the perinatal/neonatal data collection form; ROC, receiver operating characteristic; AUC, area under the curve; OR, odds ratio