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Table 3 Results of the first and second QFT (negative: <0.35 IU/mL, positive: ≥0.35 IU/mL)

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

Negative

Positive

n

%

n

%

n

%

Negative

657

83.7

128

16.3

785

 

Positive

120

29.0

294

71.0

414

 

All

777

64.8

422

35.2

1,199

100.0