Table 2. The primary outcome.

	NIPPV (143)	NCPAP (143)	Odds Ratio	95% confidence interval	P-value
intubation (yes: no; %)	17:126(11.9%)	28:115(19.6%)	2.579	0.862–7.715	0.080
≤32 weeks (73)	11:62(15.1%)	19:54(26.0%)	1.790	0.460–6.969	0.134
32–33 weeks (55)	5:50(9.1%)	8:47(14.5%)	1.536	0.149–15.821	0.549
34–36 weeks (15)	1:14(6.7%)	1:14(6.7%)	0.929	0.803–1.074	1.000
Intubation after surfactant (yes: no; %) (122)	14:108(11.1%)	24:98(19.7%)	2.602	0.784–8.642	0.087
≤32 weeks (56)	7:49(12.5%)	8:48(14.3%)	2.867	0.451–18.212	1.000
32–33 weeks (51)	7:44(13.7%)	16:35(31.4%)	1.788	0.350–9.138	0.049
34–36 weeks (15)	0:15	0:15	—	—	—