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Table 5 Comparison of the four diagnostic indicators for the EC skin test

From: Induration or erythema diameter not less than 5 mm as results of recombinant fusion protein ESAT6-CFP10 skin test for detecting M. tuberculosis infection

 

TB patients VS. Healthy volunteers

Bacteriologically positive TB patients VS. Healthy volunteers

Bacteriologically negative TB patients VS. Healthy volunteers

Extrapulmonary TB patients VS. Healthy volunteers

Sensitivity

 Induration

84.25%

86.55%

80.50%

86.57%

 Erythema

90.85%a

93.65%a

86.52%a

92.54%

 Induration or Erythema

91.25%a

94.16%a

86.88%a

92.54%

 Induration + Erythema

83.85%

86.29%

80.14%

86.57%

 χ2

33.50

24.98

8.37

2.55

P

<0.01

<0.01

0.04

0.47

Specificity

 Induration

91.15%

91.15%

91.15%

91.15%

 Erythema

89.83%

89.83%

89.83%

89.83%

 Induration or Erythema

89.63%

89.63%

89.63%

89.63%

 Induration + Erythema

91.35%

91.35%

91.35%

91.35%

 χ2

4.13

4.13

4.13

4.13

P

0.25

0.25

0.25

0.25

Consistency

 Induration

88.88%

90.20%

89.48%

90.96%

 Erythema

90.16%

90.62%

89.31%

89.94%

 Induration or Erythema

90.16%

90.57%

89.20%

89.75%

 Induration + Erythema

88.88%

90.30%

89.59%

91.14%

 χ2

3.97

0.27

0.17

2.71

P

0.26

0.97

0.98

0.44

  1. acompared with Induration or Induration + Erythema