Volume 19, Number 5—May 2013
CME ACTIVITY - Research
Transmission of Mycobacterium tuberculosis Beijing Strains, Alberta, Canada, 1991–2007
Deanne Langlois-Klassen, Ambikaipakan Senthilselvan, Linda Chui, Dennis Kunimoto, L. Duncan Saunders, Dick Menzies, and Richard Long
Table 5
Sensitivity analyses of the relative transmission index of Mycobacterium tuberculosis lineage, Alberta, Canada, 1991–2007
| Variable | Transmission Index |
Relative transmission index (95% CI)* |
|||
|---|---|---|---|---|---|
| Beijing | Non-Beijing | Unadjusted | Adjusted† | ||
| Cutoff period, y | |||||
| 2 | 0.06 | 0.14 | 0.45 (0.25–0.83) | 0.82 (0.41–1.67) | |
| 3 | 0.09 | 0.18 | 0.50 (0.29–0.89) | 1.04 (0.53–2.06) | |
| 5 |
0.11 |
0.33 |
0.33 (0.17–0.63) |
0.86 (0.41–1.79) |
|
| Overall |
0.15 |
0.39 |
0.38 (0.26–0.54) |
0.58 (0.39–0.87) |
|
| Inclusion of nonpulmonary secondary cases‡ | 0.07 | 0.17 | 0.42 (0.23–0.74) | 0.70 (0.36–1.36) | |
*Boldface indicates significance (p<0.05).
†Adjusted for sex, age at diagnosis, population group, sputum smear status, lung cavitation and M. tuberculosis lineage.
‡Using a 2-year cutoff period.
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