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Table 3 Proportions of negative cases (conversion rates) after different durations of treatment according to HIV status

From: Smear microscopy and culture conversion rates among smear positive pulmonary tuberculosis patients by HIV status in Dar es Salaam, Tanzania

Type of test Duration of treatment (weeks) HIV positive % (n/N) HIV negative % (n/N) P value
Zeihl Neelsen smear     
  2 72.8(107/147) 63.3(197/311) 0.0457
  8 98.6(139/141) 97.0(295/304) 0.52
  12 99.3(140/141) 98.0(298/304) 0.56
  20 99.3(140/141) 99.0(301/304) 0.80
Fluorescence 2 72.8(107/147) 63.2(196/310) 0.0433
  8 98.6(139/141) 97.0(294/303) 0.51
  12 99.3(140/141) 98.0(297/303) 0.55
  20 99.3(140/141) 99.0(300/303) 0.80
Culture 2 59.4(85/143) 51.8(156/301) 0.13
  8 95.7(134/140) 92.5(272/294) 0.21
  12 98.6(137/139) 97.3(285/293) 0.62
  20 100(138/138) 98.6(289/293) 0.40