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Table 1 Relative risk for developing RF-positive or RF-negative RA in men exposed to mineral oils

From: Association between occupational exposure to mineral oil and rheumatoid arthritis: results from the Swedish EIRA case–control study

Outcome Oil Exposed cases/controls (n)a Relative riskb 95% confidence interval Relative riskc 95% confidence interval
Total RA Cutting fluid 36/39 1.1 0.7–1.9 1.1 0.7–1.8
  Motor oil 84/84 1.2 0.9–1.8 1.2 0.9–1.8
  Hydraulic oil 83/72 1.4 1.0–2.1 1.4 1.0–2.0
  Form oil 25/24 1.3 0.7–2.5 1.3 0.7–2.4
  Asphalt 13/14 1.3 0.6–2.8 1.2 0.6–2.7
  Any mineral oil 135/132 1.3 1.0–1.7 1.3 1.0–1.7
RF+ RA Cutting fluid 29/39 1.4 0.8–2.5 1.4 0.8–2.4
  Motor oil 60/84 1.4 0.9–2.1 1.4 0.9–2.1
  Hydraulic oil 56/72 1.6 1.0–2.3 1.5 1.0–2.3
  Form oil 20/24 1.7 0.9–3.3 1.7 0.9–3.2
  Asphalt 9/14 1.4 0.6–3.5 1.4 0.6–3.4
  Any mineral oil 96/132 1.5 1.0–2.0 1.4 1.0–2.0
RF- RA Cutting fluid 7/39 0.6 0.2–1.4 0.6 0.2–1.4
  Motor oil 24/84 0.9 0.6–1.6 0.9 0.5–1.6
  Hydraulic oil 27/72 1.2 0.7–2.1 1.2 0.7–2.1
  Form oil 5/24 0.6 0.2–1.8 0.6 0.2–1.8
  Asphalt 4/14 0.9 0.3–3.0 0.9 0.3–3.0
  Any mineral oil 39/132 1.0 0.6–1.5 1.0 0.6–1.5
  1. Relative risk and 95% confidence interval for developing rheumatoid factor (RF)-positive rheumatoid arthritis (RA), RF- RA and RA overall (total RA) for men 18–70 years old exposed to different kinds of mineral oils compared with unexposed men.
  2. aRF status unknown for one unexposed case.
  3. bAdjusted for age and residential area.
  4. cAdjusted for age, residential area and smoking.