Table 4 Conversion and reversion rates depending on the use of a borderline zone and the time span between the first and second QFT
Time between first and second QFT | Second QFT | Total | ||||||
|---|---|---|---|---|---|---|---|---|
<0.2 IU/mL | 0.2– <0.7 IU/mL | ≥0.7 IU/mL | ||||||
n | % | n | % | n | % | n | % | |
First QFT <0.2 IU/mL | ||||||||
<9 months | 167 | 83.1 | 22 | 10.9 | 12 | 6.0 | 201 | 100.0 |
9– < 16 months | 263 | 89.5 | 19 | 6.5 | 12 | 4.1 | 294 | 100.0 |
≥16 months | 158 | 71.2 | 32 | 14.4 | 32 | 14.4 | 222 | 100.0 |
First QFT ≥0.7 IU/mL | ||||||||
<9 months | 34 | 30.6 | 15 | 13.5 | 62 | 55.9 | 111 | 100.0 |
9– < 16 months | 4 | 3.8 | 16 | 15.2 | 85 | 81.0 | 105 | 100.0 |
≥16 months | 7 | 7.5 | 15 | 16.1 | 71 | 76.3 | 93 | 100.0 |