Skip to main content

Table 2 The diagnostic evaluation of induration and erythema after 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

Diagnostic index Different times χ2 P
24 h 48 h 72 h
Induration results
 Sensitivity 72.14%a 84.25% 83.78% 43.80 <  0.01
 Specificity 97.49%a 91.15% 56.81 <  0.01
 PV+ 93.38%a 82.37% 35.30 <  0.01
 PV 87.70%a 92.18% 17.41 <  0.01
 Consistency 89.14%a 88.88% 0.08 0.78
 YI 69.63% 75.40%   
 Kappa (95% CI) 0.74 (0.71, 0.77) 0.75 (0.72, 0.78)   
Erythema results
 Sensitivity 85.33%a 90.85% 91.08% 16.18 <  0.01
 Specificity 95.38%a 89.83% 34.02 <  0.01
 PV+ 90.06%a 81.42% 22.74 <  0.01
 PV 92.98%a 95.24% 6.78 0.01
 Consistency 92.07%a 90.16% 5.06 0.02
 YI 80.71% 80.68%   
 Kappa (95% CI) 0.82 (0.79, 0.85) 0.78 (0.75, 0.81)   
  1. PV+ Positive predict value, PV Negative predict value, YI Youden index
  2. acompared with 48 h and 72 h or compared with 48 h
\