|
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)
|
–
| | |
- PV+ Positive predict value, PV− Negative predict value, YI Youden index
- acompared with 48 h and 72 h or compared with 48 h
