Table 1. Characteristics and MDR status of patients without known risk factors.
| Exposure variable | MDR | Non MDR | Crude OR (95% CI) | |
| N | n (%) | n (%) | ||
| Age | ||||
| Median (IQR) | 26.02 (23.16–32.04) | 27.52 (22.58–36.56) | ||
| <25 | 226 | 16 (7.1) | 210 (92.9) | 1 |
| 25–34 | 197 | 13 (6.6) | 184 (93.4) | 1.08 (0.51–2.30) |
| >35 | 159 | 8 (5.0) | 151 (95.0) | 1.44 (0.60–3.45) |
| Sex | ||||
| Male | 308 | 19 (6.2) | 289 (93.8) | |
| Female | 268 | 18 (6.7) | 250 (93.3) | 1·09 (0.56–2.13) |
| TB contact * | ||||
| No | 337 | 20 (5.9) | 317 (94.1) | |
| Yes | 247 | 16 (6.5) | 231 (93.5) | 1.09 (0.56–2.16) |
| Previous prophylaxis | ||||
| No | 535 | 34 (6.4) | 501 (93.6) | |
| Yes | 14 | 0 (0) | 14 (100.0) | 0.5 (0.003–0.89)** |
| Tobacco use | ||||
| No | 486 | 30 (6.2) | 456 (93.8) | |
| Yes | 79 | 7 (8.9) | 72 (91.1) | 1.48 (0.63–3.49) |
| Residency within the district | ||||
| Upper area | 312 | 16 (5.1) | 297 (94.9) | |
| Lower area | 272 | 21 (7.7) | 251 (92.3) | 1.55 (0.79–3.04) |
*Patient states having been in contact with a person with active TB who is alive and whose episode of TB was not report to be MDR TB.
**To calculate this odds ratio (OR), 0·5 was added to each value, and the standard formulae for OR, confidence intervals and p-value were applied.