Skip to main content

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