Table 4 Male/Female characteristics of preterm (≤30 weeks gestation) and very low birth weight Infant (< 1,500 g) groups
From: Actuarial survival of a large Canadian cohort of preterm infants
|  | Preterm (≤30 weeks gestation) | Very low birth weight (< 1,500 g) | ||
|---|---|---|---|---|
| Â | Male n = 1741 (56%) | Female n = 1376 (44%) | Male n = 1797 (53%) | Female n = 1601 (47%) |
Demographics | Â | Â | Â | Â |
Mean birth weight (grams) | 1102 | 1032* | 1050 | 1031* |
Mean gestational age (weeks) | 27.4 | 27.4 | 27.9 | 28.3* |
Small for gestational age (%) | 13.6 | 16.1* | 24.4 | 28.2* |
5-minute Apgar score (mean) | 7.2 | 7.3 | 7.2 | 7.4* |
Outborn (%) | 21.4 | 21.7 | 21.4 | 19.9 |
Antenatal steroids (%) | 69.3 | 71.3 | 66.2 | 69.4* |
SNAP-II (mean) | 26.6 | 27.2 | 26.5 | 24.8* |
Outcomes | Â | Â | Â | Â |
Survival (%) | 85.2 | 86.9 | 85.6 | 88.9* |
Necrotizing enterocolitis (%) | 6.5 | 7.0 | 6.6 | 6.3 |
Patent ductus arteriosus (%) | 28.0 | 32.3* | 27.3 | 28.8 |
Seizures (%) | 4.6 | 4.9 | 4.5 | 4.2 |
Chronic lung disease (%) | 25.1 | 21.7* | 25.7 | 18.9* |
Primary infection (%) | 1.8 | 2.0 | 1.6 | 1.6 |
Nosocomial infection (%) | 21.2 | 22.1 | 21.9 | 20.9 |
Intraventricular hemorrhage (≥grade 3) (%) | 9.6 | 7.5* | 9.1 | 6.4* |
Retinopathy of prematurity (≥stage 3) (%) | 10.9 | 10.8 | 10.5 | 9.7 |
Resource use | Â | Â | Â | Â |
NTISS (mean) | 17.5 | 17.1 | 17.1 | 16.0* |
Assisted ventilation (%) | 88.7 | 86.7 | 83.9 | 79.6* |
Number of ventilated days (mean) | 18.0 | 17.1 | 17.5 | 14.9* |
Surgery (%) | 21.2 | 14.5* | 21.6 | 12.9* |
Length of NICU stay (mean) (days) | 48.1 | 48.9 | 47.6 | 45.7 |