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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