Table 1

Patient characteristics and association of birth weight with demographic and outcome variables

Variables tested	Overall cohort details (n=569)	Comparisons and correlations with birth weight*	P value
Age (days)	13.0±7.5	−0.159	<0.001
Gender
Male	355 (62.5%)	2.755±0.45	0.173
Female	213 (37.5%)	2.817±0.52	0.173
Weight at surgery (kg)	2.86±0.50	0.903	<0.001
Birthweight category
Normal	445 (78.3)	2.987±0.37	<0.001
<2.5 kg	123 (21.6%)	2.170±0.30	<0.001
Height (cm)	48.9±4.0	0.417	<0.001
Type of surgery
Corrective	482 (84.9%)	2.797±0.50	0.773
Palliative	86 (15.1%)	2.778±0.45	0.773
RACHS-I category
1, 2 and 3	334 (58.8%)	2.782±0.51	0.474
4, 5 and 6	232 (40.8%)	2.815±0.47	0.474
Prematurity
Absent	541 (95.2%)	2.848±0.44
Present	27 (4.8%)	1.852±0.45	<0.001
Non-cardiac abnormality
Present	547 (96.3)	2.800±0.49	0.151
Absent	21 (3.7%)	2.624±0.48	0.151
Chromosomal abnormality
Present	558 (98.2)	2.797±0.49	0.346
Absent	10 (1.8%)	2.640±0.49	0.346
Other medical illness
Present	22 (3.9%)	2.799±0.49	0.234
Absent	546 (96.1%)	2.665±0.56	0.234
Prenatal diagnosis
Absent	486 (85.6%)	2.785±0.49	0.332
Present	82 (14.4%)	2.846±0.50	0.332
Admission epoch
2011–2014	294 (51.8%)	2.746±0.46	0.026
2015–2018	274 (48.2%)	2.844±0.52	0.026
Operations
Closed heart	115 (20.2%)	2.677±0.59	0.013
Open heart	453 (79.8%)	2.828±0.46	0.013
Aortic cross-clamp time (min)	113.0 (76.0–141.3)	−0.032	0.556
Cardiopulmonary bypass time (min)	189.0 (145.8–237.3)	−0.022	0.671
Outcomes
In-hospital mortality
No	529 (93.1%)	2.806±0.49	0.021
Yes	39 (6.9%)	2.589±0.47	0.021
Hospital stay (days)	15.0 (12.0–21.8)	0.042	0.353
ICU stay (h)
All	168.0 (120.0–272.3)	−0.045	0.323
Survivors	168.0 (120.0–264.0)
Decedents	204.0 (72.0–360.0)
Ventilation duration (h)
All	68.0 (44.0–132.3)	−0.059	0.197
Survivors	68.0 (44.0–121.0)
Decedents	117.0 (35.5–313.0)
Surgical site infection
No	523 (92.1%)	2.765±0.48	<0.001
Yes	45 (7.9%)	3.136±0.53	<0.001
Postoperative sepsis
No	433 (76.2%)	2.824±0.48	0.014
Yes	135 (23.8%)	2.693±0.54	0.014
Additional 1-month follow-up mortality
No	548 (96.5%)	2.802±0.49	0.052
Yes	20 (3.5%)	2.550±0.46

*Correlation coefficient (r) for continuous variables and mean±SD for binary variables.
RACHS-I, Risk Adjustment for Congenital Heart Surgery.