| | National Reference Laboratory (NRL SSS-HIV test) |
|---|
PMTCT sites results | HIV+ | HIV− | Total |
Test + | a | b | a + b |
Test− | c | d | c + d |
Total | a + c | b + d | a + b + c + d |
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\( Reference\;HIV\; Prevalence=100\times \frac{a+c}{a+b+c+d} \)
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\( Sensitivity\kern4.56em =100\times \frac{a}{a+c} \)
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\( Positive\ Predictive\ Value = 100\times \frac{a}{a+b} \)
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\( PMTCT\kern0.24em HIV\kern0.48em rate\kern1.68em =100\times \frac{a+b}{a+b+c+d} \)
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\( Specificity\kern4.08em =100\times \frac{d}{b+d} \)
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\( Negative\; Predictive\; Value=100\times \frac{d}{c+d} \)
