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Table 3 Measure of the effect of PMTCT HIV test status on estimated HIV prevalence, Brazil 2010–2012

From: Transitioning from antenatal surveillance surveys to routine HIV testing: a turning point in the mother-to-child transmission prevention programme for HIV surveillance in Brazil

   ANC SS test results by availability of PMTCT HIV test
  Total   Percent bias Prevalence ratio difference
  PMTCT received PMTCT not received  
HIV + 119 89 30   
Total 36,016 30,588 5428   
HIV prevalence 0.37 (0.29–0.46) 0.33 (0.25–0.44) 0.59 (0.38–0.91) −10.80% 0.56
  PMTCT missing PMTCT not missing  
HIV + 126 1 125   
Total 36,713 732 35,981   
HIV prevalence 0.38 (0.31–0.48) 0.48 (0.07–3.3) 0.38 (0.30–0.48) 26.3% 1.26