Table 3. Cox regression analysis of mortality within 90 days for CDH patients.

Variables	HR	95% CI	P value
Surgical timing 24–48 hours (<24 hours as ref）	0.114	0.043 to 0.313	<0.001
Surgical timing ≥48 hours (<24 hours as ref）	0.200	0.031 to 1.267	0.087
GA at prenatal diagnosis	0.862	0.78 to 0.953	0.004
o/e LHR	0.916	0.882 to 0.951	<0.001
Liver herniation	3.369	1.397 to 8.129	0.007
OI	1.185	1.114 to 1.221	<0.001
Open surgery	4.752	2.07 to 10.908	0.001
Repair with patch	5.709	2.365 to 13.779	<0.001
Defect phase	4.44	1.823 to 10.826	0.001

CDHcongenital diaphragmatic herniaGAgestational ageo/e LHRobserved-to-expected lung-to-head ratioOIoxygen index