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Table 3 Outcomes of screening for HIV infection in 10,000 pregnant women

From: Prevalence and risk factors for Hepatitis C and HIV-1 infections among pregnant women in Central Brazil

Variables

Prevalence 0.09%

Women screened, n

10 000

Women identified as HIV-1 positive

9

Women receiving test results

8.1 (91%)a

Women receiving antiretroviral therapy (ARV)

4.9 – 7.4 (60% – 90%)a

Women submitted to elective cesarean

3.0 – 4.1 (37% – 50%)a

Cases of mother-to-child transmission (MCT) expected among women without intervention

1.14 – 2.04 (14% – 25%)a

Number of cases of mother-to-child transmission prevented with ARV

0.59 (95% CI 0.49–0.64)b

1.59 (95% CI 1.32–1.71)b

Number needed to screen (NNS) to prevent one case of infant HIV infection

4,542 (95% CI 4,141–5,346)c

11,800 (95% CI 10,730–13,928)d

  1. MCT = Mother-to-Child Transmission
  2. ARV = Antiretroviral Therapy
  3. a values in parenthesis are from literature sources
  4. b values obtained from the model
  5. c NNS calculated from the combination of preventive measures: ARV (90% and cesarean section (50%)
  6. d NNS calculated from the combination of preventive measures: ARV (60% and cesarean section (37%)