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Table 4 Multivariate logistic regression analyses of independent factors as predictors of PTB

From: The risk of pulmonary tuberculosis in underground copper miners in Zambia exposed to respirable silica: a cross-sectional study

Variables OR 95 % CI
Age at certification 1.1 1.0–1.1
Current smoker* 4.3 1.9–9.9
Cumulative respirable silica dust exposure
 Low 1  
 Medium 2.8 0.7–10.6
 High** 6.4 1.8–23.0
  1. Miners with unknown smoking status not included
  2. Current smokers compared with current non-smokers
  3. CI confidence interval, OR odds ratio
  4. p < 0.01*, p < 0.05**