Table 4

Number of cases with dengue during pregnancy (N) and risk ratio (RR) for the association dengue during pregnancy by timing of disease and adverse birth outcomes (preterm birth, low birth weight and small for gestational)

OutcomeOutcomes within 10 days of disease onset
(95% CI)
Outcomes after 10 days from disease onset
(95% CI)
Preterm birth n=1 191 719
 N751314
 Crude RR (95% CI)2.1 (1.7 to 2.7)1.1 (1.0 to 1.1)
 Adjusted RR (95% CI)2.0 (1.6 to 2.6)1.1 (1.0 to 1.1)
Low birth weight n=1 206 375
 N741410
 Crude RR (95% CI)2.1 (1.6 to 2.6)1.1 (1.1 to 1.2)
 Adjusted RR (95% CI)2.0 (1.6 to 2.6)1.1 (1.1 to 1.2)
Small for gestational age (<10th centile) n=287 173
 N483
 Crude RR (95% CI)0.5 (0.2 to 1.5)1.0 (0.9 to 1.1)
 Adjusted RR (95% CI)0.5 (0.2 to 1.5)1.0 (0.9 to 1.1)
  • Brazil, 2006–2012.

  • Adjusted for maternal age, education and marital status.