Table 2:
Selected birth characteristics
Characteristic
Mean ± SD
Range
Maternal age at delivery, yr
31.4 ± 5.1
n
= 424
18-46
Gestational age, wk
39.1 ± 1.3
n
= 423
36-42
Birth weight, g
3263 ± 493.0
n
= 422
2268-4610