Number of cases with dengue during pregnancy (N) and OR for the association dengue during pregnancy by severity of disease and adverse birth outcomes (preterm birth, low birth weight and small for gestational)
| Outcome | Dengue fever | Complicated dengue | Haemorrhagic fever |
| Preterm birth (<37 weeks) n=1 192 920 | |||
| N (%) | 1234 | 30 | 12 |
| Crude OR (95% CI) | 1.1 (1.0 to 1.1) | 1.4 (0.9 to 1.9) | 2.4 (1.3 to 4.3) |
| Adjusted OR (95% CI) | 1.1 (1.0 to 1.1) | 1.4 (0.9 to 2.0) | 2.4 (1.3 to 4.4) |
| Low birth weight (<2500 g) n=1 206 265 | |||
| N | 1327 | 36 | 11 |
| Crude OR (95% CI) | 1.1 (1.1 to 1.2) | 1.6 (1.2 to 2.3) | 2.1 (1.1 to 4.0) |
| Adjusted OR (95% CI) | 1.1 (1.1 to 1.2) | 1. 6 (1.1 to 2.3) | 2.1 (1.1 to 4.0) |
| Small for gestational age (10th centile) n=287 474 | |||
| N | 294 | 6 | 1 |
| Crude OR (95% CI) | 1.0 (0.9 to 1.1) | 2.2 (0.9 to 5.1) | 2.0 (0.3 to 11.4) |
| Adjusted OR (95% CI) | 1.0 (0.9 to 1.1) | 2.3 (1.0 to 5.3) | 2.1 (0.4 to 12.2) |
Brazil, 2006–2012.
Adjusted for maternal age, education and marital status.