Table 3

Odds of silica-type PMF versus non-silica-type (ie, mixed-type or coal-type) PMF

OR95% CIOR95% CI
Year of birth†
Age at death0.980.951.021.020.981.07
Years of underground coal mining0.970.951.000.980.951.01
Region worked
 Central Appalachia‡1.110.622.020.980.521.86
 Rest of USARefRef
  • *Adjusted ORs and CIs are derived from a multivariate logistic regression model that includes all covariates listed in the table.

  • †Every 5 years after 1885.

  • ‡Central Appalachia includes Kentucky, Virginia and West Virginia.

  • PMF, progressive massive fibrosis.