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Descriptive characteristics of women in the British Columbia Perinatal Database Registry, British Columbia, Canada between 2000–2009 (n=351 922).
| Characteristic | Mean± SD or n(%) |
|---|---|
| Maternal age (years) | 30.2± 5.6 |
| Parity | |
| 0 | 159,877 (45.4) |
| ≥1 | 192,045 (54.6) |
| Gestational weight gain (kg) | 14.9± 5.6 |
| Maternal pre-pregnancy body mass index (kg/m2) | 24.0± 5.0 |
| Smoking during current pregnancy (yes) | 38,957 (11.1) |
| Gestational age at delivery (weeks) | 38.8 (2.0) |
| Birth≤ 32 weeks | 3,212 (0.9) |
