Table 1.
Baseline Characteristics
| ISVMP (n=166) | Historical (n=168) | P Value | |
|---|---|---|---|
| Male sex | 92 (55) | 109 (65) | 0.1 |
| Birth weight, kg | 3.2±0.5 | 3.2±0.5 | 0.9 |
| Birth WAZ | −0.48±0.96 | −0.52±0.95 | 0.72 |
| Gestational age, wk | 38.5±1.4 | 38.1±1.7 | 0.04 |
| Prematurity (<37 wk) | 13 (8) | 20 (12) | 0.21 |
| Prenatal diagnosis | 155 (97) | 149 (90) | 0.007 |
| Presence of genetic syndrome | 6 (3.6) | 6 (3.6) | 1 |
| Presence of heterotaxy syndrome | 18 (11) | 10 (6) | 0.11 |
| Pulmonary vein abnormalities | 20 (12) | 10 (6) | 0.06 |
| Anatomy | 0.76 | ||
| HLHS | 84 (51) | 90 (54) | |
| HLHS with aortic atresia | 30 | 26 | |
| Tricuspid atresia | 12 | 10 | |
| Ebstein anomaly | 3 | 1 | |
| Atrioventricular canal defect | 20 | 15 | |
| Double‐outlet right ventricle | 13 | 15 | |
| PA/IVS | 14 | 11 | |
| Other | 20 | 26 |
Counts are expressed as n (%), and continuous variables are expressed as mean±SD. Means were compared using Student t or Wilcoxon–Mann–Whitney U tests for continuous variables, as appropriate. Categorical variables were compared using the χ2 or Fisher exact test. HLHS indicates hypoplastic left heart syndrome; ISVMP, infant single‐ventricle management and monitoring program; PA/IVS, pulmonary atresia with intact atrial septum; WAZ, weight‐for‐age Z score.