|
Characteristics
|
Total (n = 10,624)
|
|---|
|
Male, n (%)
|
5895 (55.5)
|
|
Primiparity, n (%)
|
5955 (56.1)
|
|
Gestational age, weeks
|
35.0 ± 1.8
|
|
Birth weight, g
|
2463 ± 520
|
|
Birth weight z-scorea
|
0.04 ± 0.91
|
|
Caesarean section, n (%)
|
6376 (60.0)
|
|
Maternal age, years
|
29.7 ± 4.9
|
|
Paternal age, years
|
31.7 ± 5.9
|
|
≥ college (maternal education)
|
6945 (76.6)
|
|
≥ college (paternal education)
|
7102 (78.3)
|
|
Subgroup by gestational age
|
|
< 28 weeks, n (%)
|
40 (0.4)
|
|
28 ~ 31+ 6 weeks, n (%)
|
642 (6.0)
|
|
32 ~ 33+ 6 weeks, n (%)
|
1161 (10.9)
|
|
34 ~ 36+ 6 weeks, n (%)
|
8781 (82.7)
|
|
Subgroup by birth weight
|
|
< 1000 g, n (%)
|
35 (0.3)
|
|
1000-1499 g, n (%)
|
437 (4.1)
|
|
1500 ~ 2499 g, n (%)
|
4810 (45.3)
|
|
> 2500 g, n (%)
|
5342 (50.3)
|
|
Intrauterine growth status
|
|
SGA, n (%)
|
681 (6.4)
|
|
AGA, n (%)
|
9141 (86.0)
|
|
LGA, n (%)
|
802 (7.6)
|
- a Z-scores were computed according to the Fenton Preterm Infants Growth Charts;
- SD standard deviation; SGA small for gestational age; AGA appropriate for gestational age; LGA large for gestational age
