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Table 3 Results of second QFT depending on concentration of first QFT

From: The effect of introducing IGRA to screen French healthcare workers for tuberculosis and potential conclusions for the work organisation

  Second QFT
  Negative Positive All
First QFT N % n % N %*
< 0.2 IU/mL 85 97 3 3 88 76
0.2–0.35 IU/mL 8 73 3 27 11 10
Negative QFT 93 94 6 6 99 86
0.35- < 0.7 IU/mL 4 40 6 60 10 8
+0.7 IU/mL 1 14 6 86 7 6
Positive QFT 5 29 12 71 17 14
  1. *Column per cent.