Table 1.
Comparison of the perinatal/obstetrical variables between 2006 and 2010: results of the univariate analysis (total).
| 2006 | 2010 | P | |
|---|---|---|---|
| Number | 27,723 | 38,008 | |
| Birth weight (g) | 2950.84 (510.24) | 2937.52 (505.12) | <0.0001 |
| Gestational age at delivery (wks) | 39.087 (1.933) | 38.985 (1.930) | <0.0001 |
| Maternal height (cm) | 158.338 (5.436) | 158.471 (5.492) | 0.006 |
| Maternal age (yr) | 31.119 (5.015) | 32.002 (5.209) | 0.006 |
| Pregestational BMI | 21.057 (3.347) | 21.092 (3.44) | 0.041 |
| Weight gain during pregnancy (kg) | 9.846 (4.454) | 9.842 (4.333) | 0.744 |
| IVF-ET | 637 (2.3%) | 1,672 (4.4%) | <0.0001 |
| Primiparity | 14,693 (53.0%) | 20,676 (54.4%) | <0.0001 |
| Smoking | 1,807 (5.3%) | 1,672 (4.4%) | <0.0001 |
| Induction of labor | 6,542 (23.6%) | 10,224 (26.9%) | <0.0001 |
| Cesarean delivery | 6,986 (25.2%) | 10,832 (28.5%) | <0.0001 |
() represents the standard deviation or %.