Incidence rate ratio (IRR) of Zka virus infected pregnant individuals living in neighbourhoods in the city of Recife grouped by mean monthly income of household heads
| Mean monthly income of household heads | No of neighbourhoods per group | Mean monthly income (R$) | No (row %) of pregnant individuals with ZIKV | No of children under 1 year | IRR | 95% CI |
| Highest income (≥5 × minimum wage) | 13 | 5098 | 4 (0.04%) | 9298 | 1.00 | Ref |
| Medium income (2 to <5 × minimum wage) | 12 | 3024 | 7 (0.10%) | 6829 | 3.11 | 1.25 to 7.76 |
| Low income (1 to <2 × minimum wage) | 32 | 1281 | 58 (5.10%) | 1138 | 4.30 | 2.00 to 9.20 |
| Very low income (<1 × minimum wage) | 37 | 644 | 75 (3.71%) | 2023 | 4.08 | 1.88 to 8.85 |
BRL, Brazilian Real.