Control (≥ 37 weeks' gestation) | Preterm (<35 weeks' gestation) | P value | |
---|---|---|---|
Number of deliveries | 553 | 228 | |
Median gestational age at delivery (completed weeks) and range | 40 (Range 37-42) | 33 (Range 23 - 34) | Not Applicable |
Maternal age | |||
Mean maternal age at delivery (years) | 28.8 (SD 6.04) (Range 15-44) | 29.4 (SD 6.69) (Range16-46) | 0.24 |
≤ 18 years | 33 (6.0%) | 13 (5.7%) | |
19-39 years | 509 (92.0%) | 199 (87.3) | 0.002 |
>39 years | 11 (2.0%) | 16 (7.0%) | (Comparison of proportions of mothers >39 years P < 0.001) |
Body mass index | |||
Mean BMI at booking (kg/m2) | 25.03 (SD 5.29) (Range 16-49) (n = 531) | 25.8 (SD 6.71) (Range 15-60) (n = 195) | 0.10 |
Lean <20 | 42 (7.9%) | 24 (12.3%) | 0.054 |
Normal 20 - 29.9 | 402 (75.7%) | 131 (67.2%) | |
Obese ≥30 | 87 (16.4%) | 40 (20.5%) | |
Socioeconomic | |||
With social problems | 60/548 (10.9%) | 50/218 (22.9%) | <0.001 |
Smoking during pregnancy | 114/553 (20.6%) | 83/226 (36.7%) | <0.001 |
Drinking Alcohol during pregnancy | 180/550 (32.7%) | 75/228 (32.9%) | 0.96 |
Using drugs during pregnancy | 20/553 (3.6%) | 12/226 (5.3%) | 0.28 |