Table 3. Demographic and occupational characteristics of a study population (n = 311) linked to a dairy production and livestock facility in Mexico.
| Characteristic | No.(%) |
| Median (IQR) | |
| Age | 36 (27–45) |
| Men | 244/311 (78.0) |
| Illiteracy | 33/308 (10.1) |
| <6 year of formal education | 137/310 (43.3) |
| Birth in a highly endemic area | 104/311 (33.4) |
| Living inside a cowshed | 188/311 (60.4) |
| Months working/living at daily facility | 132 (72–240) |
| Group of exposure | |
| High | 105/309 (33.9) |
| Medium | 145/309 (46.9) |
| Low | 59/309 (17.3) |
| Daily hours of contact with cattle | 6 (0–8) |
| BCG scar | 265/311 (85.2) |
| Previous contact with TB case | 31/308 (10.0) |
| Consumption of unpasteurized dairy products | 93/310 (30.0) |
| Previous TB diagnosis | 4/311 (1.2) |
IQR = interquartile range.