Table 1 General characteristics of the study groups.
Control (≥ 37 weeks' gestation) | Preterm (<35 weeks' gestation) | P value | |
|---|---|---|---|
Number of deliveries | 559 | 274 | |
Gestational age at delivery (completed weeks) | Median 40 (Range 37 - 42) | Median 33 (Range 23 - 34) | Not Applicable |
Ethnicity | |||
Caucasian | 464 (83.0%) | 229 (83.6%) | 0.46 |
Asian | 45 (8.1%) | 17 (6.2%) | |
African | 33 (5.9%) | 22 (8.0%) | |
Others | 17 (3.0%) | 6 (2.2%) | |
Mean maternal age (years) | 28.8 (SD 6.04) (Range 15-44) | 29.7 (SD 6.46) (Range16-46) | 0.045 |
Distribution of births | |||
Singletons | 553 (98.9%) | 228 (83.2%) | <0.001 |
Twins | 6 (1.1%) | 44 (16.1%) | |
Triplets | 0 | 2 (0.7%) |