Table 3. Univariate logistic regression analysis results for mortality after Stage I operations.

Variable	Parameter	Estimate	Standard error	Z	p
Age	β_0	-0.03	0.31	-0.09	0.93
	β_1	-0.03	0.03	-1.00	0.32
Weight (g)	β_0	1.86	1.49	1.25	0.21
	β_1	-0.001	0.001	-1.45	0.15
Categorized weight	β_0	0.29	0.54	0.53	0.59
(≤2,500 reference category)	β_1	-0.65	0.58	-1.12	0.26
Gender	β_0	-0.22	0.24	-0.94	0.35
(Male reference category)	β_1	-0.18	0.47	-0.39	0.70
Diagnosis	β_0	-1.28	0.51	-2.53	0.01*
(HLHC reference category)	β_1	1.28	0.56	2.30	0.02*
Preoperative intubation	β_0	-0.80	0.28	-2.81	0.01*
(no is reference category)	β_1	1.27	0.44	2.92	0.004*
Syndromic conditions	β_0	-0.35	0.21	-1.66	0.10
(no is reference category)	β_1	1.74	1.14	1.53	0.13
General conditions	β_0	-0.33	0.22	-1.50	0.13
(not bad is reference category)	β_1	0.51	0.64	0.79	0.43
Ascending aorta >3 mm	β_0	-0.14	0.21	-0.64	0.52
(no is reference category)	β_1	-1.94	1.08	-1.80	0.07
First surgery	β_0	-0.34	0.25	-1.36	0.18
(Hybrid is reference category)	β_1	0.22	0.44	0.50	0.62
HLHC: Hypoplastic left heart complex; *: p<0.05.