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Demographic and obstetric characteristics of patients
| Group | Total | Age (years) | Gestation (weeks) | Gravidity (n) | Parity (n) |
|---|---|---|---|---|---|
| A | 230 | 29.5 ± 3.6 | 35.6 ± 1.3 | 4.2 ± 1.1 | 2.0 ± 0.6 |
| B | 38 | 30.4 ± 4.0 | 35.5 ± 1.5 | 3.9 ± 1.0 | 2.1 ± 0.7 |
| t test | – | 1.212 | 0.533 | 1.414 | 0.821 |
| P value | – | 0.228 | 0.595 | 0.160 | 0.413 |
