Table 3.
Adjusted odds ratios for a spontaneous abortion in the first trimester.
| Factors | Adjusted OR | 95% CI | p-Value |
|---|---|---|---|
| Maternal age (>35 years) | 1.81 | 1.48–2.15 | <0.001 |
| Overweight status (≥25 kg/m2) | 1.03 | 0.86–1.19 | 0.192 |
| Smoker | 1.22 | 1.03–1.36 | 0.003 |
| Presence of chronic conditions | 1.18 | 1.06–1.35 | 0.018 |
| Previous SARS-CoV-2 infection | 0.94 | 0.72–1.14 | 0.149 |
| Abnormal uterine or cervical anatomy | 1.33 | 1.10–1.68 | <0.001 |
| Previous miscarriage | 2.02 | 1.54–2.61 | <0.001 |
| Assisted reproductive techniques | 1.09 | 0.94–1.15 | 0.042 |
| Vaccine type | |||
| Pfizer BNT162b2 | 1.04 | 0.91–1.12 | 0.086 |
| Moderna mRNA-1273 ^ | 1.02 | 0.89–1.08 | 0.175 |
| Number of doses | |||
| 1 dose ^ | 0.91 | 0.69–1.08 | 0.338 |
| 2 doses | 0.94 | 0.66–1.05 | 0.247 |
| 3 doses | 0.77 | 0.60–1.01 | 0.590 |
^—reference category.