Table 4. Association of NICU practices and PNC use.

Practice	No. of NICUs		No. Of infants		Infants at 24–29 weeks’ GA			Infants in the highest risk tertile
	n/N	%	n/N	%	Adj OR*	95% CI	P value	Adj OR*	95% CI	P value
European Association of Perinatal Medicine recommendations	16/132	12	369/3719	10	0.91	0.4–2.1	0.83	0.82	0.3–2	0.65
NICU PNC restricted use policy	47/132	36	1069/3706	29	0.29	0.2–0.5	<0.001	0.29	0.2–0.5	<0.001

* adjusted on gestational age

SGA, sex, mechanical ventilation, NSAIDs to treat PDA

OR: odds ratio; 95% CI: 95% confidence interval. n: number using NICU Policy N: total in group