| QFT 1 | QFT 2 | QFT 3 |
| 225 negative | 187/207 negative | 85/97 negative |
| 11/97 converters (11.3%) | ||
| 1 indeterminate | ||
| 20/207 converters (9.7%) | 8/11 reverters (72.7%) | |
| 3/11 positive | ||
| 54 positive | 13/51 reverters (25.5%) | 3/3 negative |
| 0/3 converters | ||
| 38/51 positive | 2/19 reverters (10.5%) | |
| 16/19 positive | ||
| 1 indeterminate | ||
| 1 indeterminate | 1 negative | 1 negative |
| Overall positivity rate | ||
| 19.4% (54/279 ) | 22.4% (58/258) | 22.9% (30/131) |
QuantiFERON-TB Gold In-Tube test results, at initial testing (QFT 1), and second (QFT 2) and third (QFT 3) test points. One student did not complete QFT 1 but did complete testing at QFT 2 and QFT 3; this student was included in the longitudinal Tobit regression model but not in the table.