Table 1.
Comparison of characteristics between the hospital population and the study sample a
| Characteristics | Hospital population b (n=8185) | Study sample (n=300) | P value c |
|---|---|---|---|
| Maternal age, y | |||
| <20 | 1981 (24.2) | 84 (28.0) | |
| 20–34 | 5346 (65.3) | 190 (63.3) | 0.336 |
| ≥35 | 858 (10.5) | 26 (8.7) | |
| Parity | |||
| Nulliparous | 3469 (42.4) | 119 (39.7) | 0.346 |
| ≥1 | 4716 (57.6) | 181 (60.3) | |
| Preterm birth, wk | |||
| <37 | 1284 (15.7) | 46 (15.3) | 0.865 |
| <35 | 659 (8.1) | 15 (5.0) | 0.071 |
| Cesarean delivery rate | 1760 (21.5) | 65 (21.7) | 0.949 |
a
Values are given as number (percentage).
b
Total hospital population available for 2007.
c
Using the χ2 test.