TABLE 1

Basic Characteristics of All Infants

CharacteristicBirth Weight
<500 g (n = 84)501–750 g (n = 409)751–1000 g (n = 486)1001–1250 g (n = 562)1251–1500 g (n = 604)All Infants (n = 2145)
GA, wk24.9 ± 2.125.4 ± 2.127.9 ± 2.229.9 ± 2.731.8 ± 2.428.9 ± 3.4
Birth weight, g426 ± 72638 ± 69883 ± 721133 ± 711380 ± 721024 ± 302
Light for GA68 (58–78)33 (28–38)33 (29–37)32 (28–36)34 (30–38)36 (34–38)
Male gender39 (29–490)53 (48–58)56 (52–60)52 (48–56)54 (50–58)53 (51–55)
Outborn11 (4–18)14 (11–17)16 (13–19)14 (11–17)14 (11–18)14 (13–15)
Multiple birth27 (18–36)29 (25–33)26 (22–30)32 (28–36)34 (30–38)30 (28–32)
1-min Apgar score2.6 ± 1.83.6 ± 2.25.9 ± 8.97.0 ± 9.97.2 ± 7.86.0 ± 8.0
5-min Apgar score4.8 ± 2.56.8 ± 9.58.6 ± 11.39.1 ± 10.48.9 ± 8.48.3 ± 9.8
Major congenital anomalies5 (3–10)6 (4–8)6 (4–8)8 (6–10)9 (7–11)7 (6–8)
  • Data are expressed as mean ± SD or percentage of n in the category with 95% CI in parenthesis.