The mean gestational age was 31±2.6 (25 - 34 weeks), and the mean birth weight was 1631±464 (700 - 2600g).
Tuổi thai trung bình 31 ± 2,6 (25-34 tuần). Cân nặng lúc sinh trung bình 1631 ± 464 (700-2600 g).