Table 2

Risk of developing RA among workers ever exposed to different types of organic dusts compared with never exposed workers (n=1 41 917)

All RA casesSeropositive RA casesSeronegative RA cases
Ever exposed cases/controlsNever exposed cases/controlsOR (95% CI)*OR (95% CI)†OR (95% CI)*OR (95% CI)†OR (95% CI)*OR (95% CI)†
Men
 Wood dust396/34623481/36 1881.2 (1.1 to 1.3)0.9 (0.8 to 1.0)1.2 (1.0 to 1.3)0.9 (0.7 to 1.0)1.2 (1.0 to 1.5)1.1 (0.9 to 1.3)
 Animal dust209/16743633/37 7031.3 (1.1 to 1.5)1.3 (1.1 to 1.5)1.3 (1.1 to 1.6)1.3 (1.1 to 1.6)1.2 (0.9 to 1.5)1.2 (0.9 to 1.5)
 Paper dust241/25643478/35 6961.0 (0.8 to 1.1)0.9 (0.8 to 1.1)1.0 (0.9 to 1.2)1.0 (0.8 to 1.2)0.9 (0.7 to 1.1)0.8 (0.7 to 1.1)
 Textile dust60/4693829/39 2861.3 (1.0 to 1.7)1.2 (0.9 to 1.6)1.4 (1.0 to 1.9)1.3 (0.9 to 1.8)1.1 (0.7 to 1.8)1.1 (0.7 to 1.7)
 Flour dust46/3653877/39 7771.3 (0.9 to 1.8)1.2 (0.9 to 1.7)1.2 (0.8 to 1.8)1.1 (0.8 to 1.7)1.5 (0.9 to 2.4)1.4 (0.9 to 2.3)
Women
 Wood dust78/6438495/87 3221.2 (1.0 to 1.6)1.2 (0.9 to 1.5)1.3 (1.0 to 1.7)1.2 (0.9 to 1.6)1.1 (0.7 to 1.7)1.1 (0.7 to 1.7)
 Animal dust207/16968424/87 0831.2 (1.1 to 1.4)1.2 (1.0 to 1.4)1.2 (1.0 to 1.4)1.1 (1.0 to 1.4)1.4 (1.1 to 1.8)1.4 (1.1 to 1.8)
 Paper dust377/34808186/84 7561.1 (1.0 to 1.2)1.1 (1.0 to 1.2)1.1 (1.0 to 1.3)1.1 (0.9 to 1.2)1.1 (0.9 to 1.3)1.1 (0.9 to 1.3)
 Textile dust317/27658257/85 2001.2 (1.0 to 1.3)1.1 (1.0 to 1.3)1.2 (1.0 to 1.4)1.1 (1.0 to 1.3)1.1 (0.9 to 1.4)1.1 (0.9 to 1.4)
 Flour dust32/3688627/88 8250.9 (0.6 to 1.3)0.8 (0.6 to 1.2)0.9 (0.6 to 1.3)0.8 (0.5 to 1.3)0.9 (0.5 to 1.8)0.9 (0.5 to 1.7)
Men and women‡
 Wood dust474/410511976/123 5101.2 (1.1 to 1.3)1.0 (0.9 to 1.1)1.2 (1.1 to 1.3)0.9 (0.8 to 1.1)1.2 (1.0 to 1.4)1.1 (0.9 to 1.3)
 Animal dust416/337012057/124 7861.3 (1.1 to 1.4)1.2 (1.1 to 1.4)1.2 (1.1 to 1.4)1.2 (1.1 to 1.4)1.3 (1.1 to 1.5)1.3 (1.1 to 1.5)
 Paper dust618/604411664/120 4521.1 (1.0 to 1.2)1.0 (0.9 to 1.1)1.1 (1.0 to 1.2)1.0 (0.9 to 1.1)1.0 (0.9 to 1.2)1.0 (0.8 to 1.1)
 Textile dust377/323412086/124 4861.2 (1.1 to 1.3)1.1 (1.0 to 1.3)1.2 (1.1 to 1.4)1.2 (1.0 to 1.3)1.1 (0.9 to 1.4)1.1 (0.9 to 1.3)
 Flour dust78/73312504/128 6021.1 (0.9 to 1.4)1.0 (0.8 to 1.3)1.0 (0.8 to 1.4)1.0 (0.7 to 1.3)1.2 (0.8 to 1.8)1.2 (0.8 to 1.8)
  • *Adjusted for county, age and index year.

  • †Additionally adjusted for education and silica dust.

  • ‡Additionally adjusted for sex.

  • RA, rheumatoid arthritis.