| Participants |  | ||
---|---|---|---|---|
LD | SPTB | Control | Â | |
Variable | n = 83 | n = 144 | n = 90 | P-value |
Maternal age, years | 34.2 (5.8) | 31.9 (6.2) | 31.4 (6.1) | < 0.01a |
Maternal age category, % | ||||
  <  30 years | 24.1 | 34.7 | 38.9 | < 0.05b |
 30–39 years | 54.2 | 56.9 | 52.2 | |
  > 40 years | 21.7 | 8.3 | 8.9 | |
Maternal height, cm | 157 (6.0) | 158 (5.9) | 158 (5.8) | 0.343a |
Primiparous, % | 91.6 | 47.2 | 58.9 | < 0.01b |
Cesarean section, % | 83.1 | 64.6 | 66.7 | < 0.05b |
Gestational age at delivery, weeks | 39.6 (1.2) | 30.7 (5.1) | 35.9 (3.4) | < 0.01a |
Birth weight at delivery, g | 3143 (398) | 1637 (836) | 2160 (770) | < 0.01a |