Table 3: Variables of reproductive history and gestational factors predicting prematurity - MEJC, Brazil, 2017.
| Variable | Odds ratio | IC 95% | p-value | R2 Cox & snell |
| Reproductive history | 0.7% | |||
| Previous vaginal delivery | ||||
| None | 1.00 | |||
| 1 to 2 | 1.23 | 1.04-1.45 | 0.019 | |
| 3 or more | 0.90 | 0.68-1.20 | 0.461 | |
| Previous caesarian section | ||||
| None | 1.00 | |||
| 1 to 2 | 0.70 | 0.58-0.85 | < 0.001 | |
| 3 or more | 0.76 | 0.38-1.51 | 0.428 | |
| Gestational factors | 6.7% | |||
| Type of pregnancy | ||||
| Single | 1.00 | |||
| Multiple | 5.41 | 3.79-7.73 | < 0.001 | |
| Prenatal care | ||||
| Adequate | 1.00 | |||
| Inadequate | 2.13 | 1.68-2.70 | 0.001 | |
| Presentation | ||||
| Cephalic | 1.00 | |||
| Breech/shoulder | 3.01 | 2.25-4.03 | < 0.001 | |
| Type of birth | ||||
| Vaginal | 1.00 | |||
| Cesarean section | 0.66 | 0.57-0.78 | < 0.001 |