Table 2

Number of cases notified with dengue during pregnancy (N), crude and adjusted risk ratio for the association among dengue during pregnancy and preterm birth, low birth weight and small for gestational age

All dengue casesLab confirmed dengue cases
NCrude Risk Ratio
(95% CI)
Adjusted Risk Ratio
(95% CI)
Crude Risk Ratio
(95% CI)
Adjusted Risk Ratio
(95% CI)
Preterm birth n=1 193 033
 Overall (<37 weeks)13891.1 (1.0 to 1.2)1.1 (1.0 to 1.2)4391.1 (1.0 to 1.2)1.1 (1.0 to 1.2)
 Less than 28 weeks1.1 (1.0 to 1.1)1.1 (1.0 to 1.2)1.0 (0.9 to 1.2)1.0 (0.9 to 1.2)
 28–32 weeks1.2 (1.1 to 1.5)1.2 (1.1 to 1.4)1.2 (0.9 to 1.6)1.2 (0.9 to 1.6)
 32–36 weeks1.2 (1.0 to 1.5)1.1 (0.9 to 1.4)1.1 (0.7 to 1.6)1.1 (0.7 to 1.6)
Low birth weight n=1 206 375
 Overall (<2500 g)14841.2 (1.1 to 1.2)1.2 (1.1 to 1.2)4751.2 (1.0 to 1.3)1.2 (1.1 to 1.3)
 1500–2499 g1.2 (1.1 to 1.2)1.2 (1.1 to 1.2)1.2 (1.0 to 1.3)1.2 (1.1 to 1.3)
 Less than 1500 g1.2 (1.1 to 1.4)1.2 (1.0 to 1.3)1.1 (0.9 to 1.4)1.1 (0.9 to 1.4)
Small for gestational age n=287 504
 <10th centile3311.0 (0.9 to 1.1)1.0 (0.9 to 1.1)680.9 (0.7 to 1.1)0.9 (0.7 to 1.2)
  • Brazil, 2006 –2012.

  • Adjusted for maternal age, education and marital status.