Table 4.
Mean number of occupational exposures reported per 6 month period between testing among participants with conversions versus persistent negatives.*
| Occupational exposures reported per 6 month period between testing | Converters (n = 63) | Stable negatives (453) | p Value: Mann Whitney test of medians |
|---|---|---|---|
| Mean number of days exposed to smear positive TB patients | 2.8 (SD: 9.9) | 5.7 (SD: 12.9) | p = 0.57 |
| Mean number of days spent working on medical wards | 17.1 (SD: 31.8) | 52.3 (SD: 67.0) | p = 0.00 |
| Mean number of days exposed to TB patients NOT on anti-TB therapy (ATT) | 0.71 (SD: 3.0) | 2.1 (SD: 5.1) | p = 0.22 |
| Mean time in minutes exposed to smear positive patients | 100.5 (SD: 193.4) | 109.3 (SD: 200.5) | p = 0.66 |
*
This analysis treats each period from QFT1 to QFT2, QFT2 to QFT3, etc., as one independent observation.