Table 6. Combined tests results of tuberculosis skin test and interferon-γ release assay.
| TST+ & IGRA+ vs any other combination | TST+&/or IGRA+ vs TST−&IGRA− | TST+& IGRA+ vs TST− & IGRA− | ||||||
| Total (n = 311) | Positive | Negative | Positive | Negative | Total (n = 190) | Positive | Negative | |
| No.(Col%) | No.(Col%) | No.(Col%) | No.(Col%) | No.(Col%) | No.(Col%) | No.(Col%) | No.(Col%) | |
| Age in years, Median (SD) | 36.9 (11.8) | 36.8 (11.5) | 37.0 (12.1) | 36.8(11.9) | 38.0 (11.4) | 37.1 (11.5) | 36.8 (11.5) | 38.0 (11.4) |
| Male | 244/311(78.0) | 123/149(83.0) | 121/162 (75.0) | 214/270 (79.0) | 30/41 (73.0) | 153/190 (81.0) | 123/149 (83.0) | 30/41 (73.0) |
| Birth in a highly endemic area | 104/311 (33.0) | 56/149 (38.0) | 48/162 (30.0) | 95/270 (35.0) | 9/41 (22.0) | 65/190 (34.0) | 56/149 (38.0) | 9/41 (22.0) |
| <6 y of education | 137/310 (44.0) | 67/149 (45.0) | 70/161 (43.0) | 119/269 (44.0) | 18/41 (44.0) | 85/190 (45.0) | 67/149 (45.0) | 18/41 (44.0) |
| >4 h of daily contact w/cattle | 181/310 (58.0) | 91/149 (61.0) | 90/161 (56.0) | 161/269 (60.0) | 20/41 (49.0) | 111/190 (58.0) | 91/149 (61.0) | 20/41 (49.0) |
| >1 y of stay in the facility | 283/309 (92.0) | 140/149 (94.0) | 143/160 (89.0) | 245/268 (91.0) | 38/41 (93.0) | 178/190 (94.0) | 140/149 (94.0) | 38/41 (93.0) |
| High exposure activity | 105/309 (34.0) | 65/148 (44.0)** | 40/161 (25.0) | 100/268 (37.0)* | 5/41 (12.0) | 70/189 (37.0) | 65/148 (44.0)** | 5/41 (12.0) |
| Unpasteurized dairy products consumption | 93/310 (30.0) | 45/148 (30.0) | 48/162 (30.0) | 75/269 (28.0)* | 18/41 (44.0) | 63/189 (33.0) | 45/148 (30.0) | 18/41 (44.0) |
| BCG scar | 265/301 (88.0) | 126/143 (88.0) | 139/158 (88.0) | 231/261 (89.0) | 34/40 (85.0) | 160/183 (87.0) | 126/143 (88.0) | 34/40 (85.0) |
| Previous contact with TB cases | 31/308 (10.0) | 15/147 (10.0) | 16/161 (10.0) | 24/267 (9.0) | 7/41 (17.0) | 22/188 (12.0) | 15/147 (10.0) | 7/41 (17.0) |
*
p<.05;
**
p<.001.