Univariate analysis of risk factors for patients belonging to IS6110 restriction fragment length polymorphism clusters
| Non-cluster group | Cluster group | All patients | p-value | |
| Patients | 1475 | 918 | 2393 | |
| Age years | 47.3±19.5 | 37.6±16.5 | 45.9±19.4 | <0.001 |
| AIDS | 110 (7.5) | 65 (7.1) | 175 (7.3) | ns |
| Resistance to any drug | 165 (11.2) | 79 (8.6) | 244 (10.2) | 0.04 |
| Beijing genotype | 99 (6.7) | 61 (6.6) | 160 (6.7) | ns |
| Foreign-born | 987 (66.9) | 422 (46.0) | 1409 (58.9) | <0.001 |
| Male/female | 851/624 (57.7/42.3) | 619/299 (67.4/32.6) | 1470/923 (61.4/38.6) | <0.001 |
| Drug abuse | 36 (2.4) | 90 (9.8) | 126 (5.3) | <0.001 |
| Alcohol abuse | 121 (8.2) | 313 (34.1) | 434 (18.1) | <0.001 |
| Homelessness | 93 (6.3) | 124 (13.5) | 217 (9.1) | <0.001 |
| Sputum smear positivity | 474 (32.1) | 447 (48.7) | 921 (38.5) | 0.001 |
| Previous history of TB | 165 (11.2) | 98 (10.7) | 263 (11.0) | ns |
| Unemployment | 371 (25.2) | 427 (46.5) | 798 (33.3) | <0.001 |
| Healthcare worker | 26 (1.8) | 29 (3.2) | 55 (2.3) | 0.027 |
Data are presented as n, mean±sd or n (%), unless otherwise stated. % refers to the total number of tuberculosis (TB) patients in the non-cluster or cluster group. ns: nonsignificant.