Table 5 Characteristics of singleton and multiple birth preterm infants
From: Actuarial survival of a large Canadian cohort of preterm infants
|  | Preterm (≤30 weeks gestation) | Very low birth weight (< 1,500 g) | ||
|---|---|---|---|---|
| Â | Singleton n = 2277 (73%) | Multiple n = 841 (27%) | Singleton n = 2424 (71%) | Multiple n = 975 (29%) |
Demographics | Â | Â | Â | Â |
Mean birth weight (grams) | 1071 | 1072 | 1031 | 1066 |
Mean gestational age (weeks) | 27.3 | 27.6* | 27.9 | 28.4* |
Small for gestational age (%) | 15.0 | 13.8 | 26.3 | 25.7 |
5-minute Apgar score (mean) | 7.2 | 7.4* | 7.2 | 7.5* |
Outborn (%) | 22.5 | 18.9* | 21.9 | 17.6* |
Antenatal Steroids (%) | 68.2 | 75.4* | 65.7 | 73.2* |
SNAP-II (mean) | 27.1 | 26.2 | 26.3 | 24.1* |
Outcomes | Â | Â | Â | Â |
Survival (%) | 86.1 | 85.7 | 87.1 | 87.4 |
Necrotizing enterocolitis (%) | 6.9 | 6.3 | 6.8 | 5.6 |
Patent ductus arteriosus (%) | 29.6 | 30.9 | 28.1 | 28.0 |
Seizures (%) | 5.3 | 3.2* | 4.8 | 3.2* |
Chronic lung disease (%) | 24.4 | 21.7 | 23.4 | 20.2 |
Primary infection (%) | 2.2 | 0.8* | 1.9 | 0.9* |
Nosocomial infection (%) | 22.1 | 21.6 | 22.0 | 20.0 |
Intraventricular hemorrhage (≥grade 3) (%) | 9.2 | 7.3 | 8.4 | 6.5 |
Retinopathy of prematurity (≥stage 3) (%) | 12.1 | 7.4* | 11.3 | 7.2* |
Resource use | Â | Â | Â | Â |
Caesarean section (%) | 43.0 | 52.4* | 48.7 | 57.7* |
NTISS (mean) | 17.3 | 17.3 | 16.8 | 16.1* |
Assisted ventilation (%) | 87.6 | 88.6 | 82.8 | 79.6* |
Number of ventilated days (mean) | 18.2 | 15.9* | 17.1 | 14.1* |
Surgery (%) | 18.8 | 17.1 | 18.4 | 15.3* |
Length of NICU stay (mean) (days) | 48.8 | 47.6 | 47.9 | 43.9* |