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Table 3 Smear-positive detection rates of direct and bleach smear microscopy (excluding SCA)*

From: Direct microscopy versus sputum cytology analysis and bleach sedimentation for diagnosis of tuberculosis: a prospective diagnostic study

Approach

Smear-positive detection rate

Compared with D1+D2

 

n

%

95% CI

p

D1+D2

120

42.9

37.0-48.9

-

B1

125

44.6

38.7-50.7

0.23

B1+B2

131

46.8

40.8-52.8

<0.01

D1+B1

128

45.7

39.8-51.7

0.01

B1+D2

127

45.4

39.4-51.4

0.04

D1+B2

127

45.4

39.4-51.4

0.02

D1+B1+D2

128

45.7

39.8-51.7

0.01

D1+D2+B2

127

45.4

39.4-51.4

0.02

D1+B1+B2

132

47.1

41.2-53.2

<0.01

B1+D2+B2

127

45.4

39.4-51.4

0.02

  1. D = direct. B = bleach sedimentation. *Based on the 2007 WHO smear-positive case definition (one smear positive with ≥1 AFB/100 high-power field).