Table 3

Exposure to organic dust and lung cancer risk

SubjectsCumulative exposure to organic dustCasesControlsOR* (95% CI)
AllNever648789401.00 (reference)
First quartile154917701.05 (0.96 to 1.15)
Second quartile187519141.15 (1.06 to 1.25)
Third quartile163418041.12 (1.03 to 1.22)
Fourth quartile175518451.24 (1.14 to 1.35)
Test for trend, p value<0.001
Never smokersNever48729711.00 (reference)
First quartile1054980.98 (0.76 to 1.26)
Second quartile1285761.07 (0.84 to 1.35)
Third quartile1295401.20 (0.95 to 1.51)
Fourth quartile1155920.98 (0.76 to 1.25)
Test for trend, p value0.440
Workers never employed in a ‘list A job’Never601885981.00 (reference)
First quartile133515861.06 (0.97 to 1.17)
Second quartile160716941.19 (1.09 to 1.30)
Third quartile139716041.14 (1.04 to 1.24)
Fourth quartile157617061.25 (1.14 to 1.36)
Test for trend, p value<0.001
  • * ORs are adjusted for age, sex, study, cigarette pack-years, time since quitting smoking (if appropriate), and ever employment in a ‘list A job’.

  • p Values for trend result from a logistic regression model with exposure as a continuous variable.