From: Evaluation of the tuberculin skin test and the interferon-γ release assay for TB screening in French healthcare workers
QFT
Negative
Positive
Total
TST
N
Row%
Col%
0-9 mm
46
90.2
5
9.8
51
34.5
10-14 mm
25
80.2
6
19.4
31
20.9
15-19 mm
19
67.9
9
32.1
28
18.9
20-40 mm
30
78.9
8
21.1
38
25.7
All
120
81.1
148
100.0