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Table 2 Conversion and reversion rates depending on the use of a borderline zone and the INF-γ concentration of the first QFT

From: Screening for tuberculosis and the use of a borderline zone for the interpretation of the interferon-γ release assay (IGRA) in Portuguese healthcare workers

First QFT

Second QFT

Total

<0.2 IU/mL

0.2– <0.7 IU/mL

≥0.7 IU/mL

n

%

n

%

n

%

n

%

<0.2 IU/mL

588

82.0

73

10.2

56

7.8

717

59.8

0.2– < 0.35 IU/mL

24

35.3

18

26.5

26

38.2

68

5.7

0.35– < 0.7 IU/mL

48

45.7

21

20.0

36

34.3

105

8.8

≥0.7 IU/mL

45

14.6

46

14.9

218

70.6

309

25.8

All

705

58.8

158

13.2

336

28.0

1199

100.0