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Table 2 Health-care work and clustering (multivariate analysis).

From: Occupational risk of tuberculosis transmission in a low incidence area

Variable Non-clustered TB Clustered TB Crude OR 95% CI Adj. ORb 95% CI
  N a % N a %     
Health-care worker         
   No 545 99.6 269 97.1 1.0 - 1.0 -
   Yes 2 0.4 8 2.9 8.1 1.7–38.4 17.9 3.6–89.3
AIDS         
   No 520 95.1 256 92.4 1.0 - 1.0 -
   Yes 27 4.9 21 7.6 1.6 0.9–2.8 0.8 0.4–1.8
Foreign-born         
   No 284 51.9 185 66.8 1.0 - 1.0 -
   Yes 263 48.1 92 33.2 0.5 0.4–0.7 0.5 0.3–0.7
Sex         
   Female 221 40.4 90 32.5 1.0 - 1.0 -
   Male 326 59.6 187 67.5 1.4 1.0–1.9 1.1 0.8–1.6
Drug abuse         
   No 517 94.5 237 85.6 1.0 - 1.0 -
   Yes 30 5.5 40 14.4 2.9 1.8–4.8 1.7 1.0–3.1
Alcohol abuse         
   No 468 85.6 164 59.2 1.0 - 1.0 -
   Yes 79 14.4 113 40.8 4.1 2.9–5.7 2.6 1.7–3.8
Homelessness         
   No 510 93.2 249 89.9 1.0 - 1.0 -
   Yes 37 6.8 28 10.1 1.6 0.9–2.6 0.9 0.5–1.7
History of contact tracing         
   No 505 92.3 211 76.2 1.0 - 1.0 -
   Yes 42 7.7 66 23.8 3.8 2.5–5.7 2.8 1.7–4.6
Sputum smear positivity         
   No 377 68.9 161 58.1 1.0 - 1.0 -
   Yes 170 31.1 116 41.9 1.6 1.2–2.2 1.2 0.9–1.8
Previous history of TB         
   No 485 88.7 234 84.5 1.0 - 1.0 -
   Yes 62 11.3 43 15.5 1.4 0.9–2.2 1.7 1.0–2.7
Unemployment         
   No 441 80.6 114 41.2 1.0 - 1.0 -
   Yes 106 19.4 163 58.8 5.9 4.3–8.2 5.2 3.6–7.5
Latency period from first symptoms to TB diagnosis         
   < 6 months 432 79.0 156 56.3 1.0 - 1.0 -
   ≥ 6 months; <12 months 95 17.4 78 28.2 2.3 1.6–3.2 6.0 3.4–10.4
   ≥ 12 months 20 3.7 43 15.5 2.6 1.7–3.8 7.5 3.7–13.9
  1. a TB patients < 16 years (n = 22) excluded from the analysis
  2. b Adjusted for foreign birth; unemployment; alcohol abuse; drug addiction; and the latency period between first symptoms and TB diagnosis; the odds ratios for homelessness and previous history of TB are additionally adjusted for history of contact tracing; the odds ratio for drug addiction is additionally adjusted for AIDS