Table 1.
Preoperative demographic and clinical data.
| Variable | Hospital A (N=106) | Hospital B (N=508) |
|---|---|---|
| Age at surgery | 6 m (4 d - 16 y) | 17 m (0 d - 66 y) |
| Gender (male) | 60 (56%) | 271 (53%) |
| Weight (kg) | 5.15 (0.65-59.55) | 9.20 (1.00-102.00) |
| Weight-for-age Z-score < -2 | 40 (37.7%) | 161 (37.1%) |
| Length or height (cm) | 62 (32-159) | 79 (36-183) |
| BMI (kg/m2) | 13.9 (6.5-24.3) | 15.6 (6.8-37.5) |
| BMI-for-age Z-score < -2 | 29 (27.4%) | 101 (23.3%) |
| Prenatal diagnosis | 8 (9.2%) | 64 (16.6%) |
| Number of previous surgeries | 0 (0-5) | 0 (0-5) |
| Prematurity | 21 (19.8%) | 32 (6.3%) |
| Major noncardiac structural anomaly | 0 | 3 (0.6%) |
| Combination procedure | 12 (11.3%) | 28 (5.5%) |
| Preoperative hematocrit (%) | 35 (23-63) | 40 (12-65) |
| Preoperative SaO2 (%) | 93 (45-100) | 96 (29-100) |
BMI=body mass index; SaO2=arterial oxygen saturation; m=months; d=days; y=years
Values are expressed as median (range) or count (proportion).