| Infertility treatment |
---|
OR | 95%CI | P-value |
---|
Model 1a | 1.954 | 1.896–2.013 |  < .001 |
Model 2b | 1.700 | 1.664–1.737 |  < .001 |
Model 3c | 1.772 | 1.718–1.827 |  < .001 |
- aUnadjusted model
- bThe model 2 was adjusted for year of inclusion, maternal age, race, education, marital status, parity, smoking status, history of preterm birth, history of cesarean, pre-pregnancy BMI, weight gain, timing of initiation of prenatal care, prenatal visit count, gestational diabetes, gestational hypertension, eclampsia, WIC, payment
- cModel 2 plus infection status: gonorrhea, syphilis, chlamydia, hepatitis B and hepatitis C