Table 2

Relative risk for developing anti-CP-positive RA or anti-CP-negative RA for men exposed to mineral oils
Outcome
 Oil
 Exposed cases/controls (n)
 Relative riska
 95% confidence interval
 Relative riskb
 95% confidence interval
Anti-CP+ RA
 Cutting fluid
 28/39
 1.6
 0.9–2.7
 1.5
 0.8–2.6

Motor oil
 57/84
 1.5
 1.0–2.2
 1.5
 1.0–2.3

Hydraulic oil
 56/72
 1.8
 1.2–2.7
 1.7
 1.1–2.6

Form oil
 16/24
 1.5
 0.7–2.9
 1.4
 0.7–2.9

Asphalt
 10/14
 1.6
 0.7–3.9
 1.5
 0.6–3.7

Any mineral oil
 93/132
 1.6
 1.1–2.2
 1.6
 1.1–2.2
Anti-CP- RA
 Cutting fluid
 8/39
 0.6
 0.2–1.3
 0.6
 0.2–1.3

Motor oil
 27/84
 0.9
 0.6–1.5
 0.9
 0.6–1.5

Hydraulic oil
 27/72
 1.0
 0.6–1.7
 1.0
 0.6–1.7

Form oil
 9/24
 1.1
 0.5–2.6
 1.1
 0.5–2.6

Asphalt
 3/14
 0.7
 0.2–2.6
 0.7
 0.2–2.6

Any mineral oil
 42/132
 1.0
 0.6–1.5
 1.0
 0.6–1.5

Relative risk and 95% confidence interval for developing antibodies to citrulline-containing peptides (anti-CP)-positive rheumatoid arthritis (RA) and anti-CP- RA for men 18–70 years old exposed to different kinds of mineral oils compared with unexposed men.

aAdjusted for age and residential area.

bAdjusted for age, residential area and smoking.

Sverdrup et al. Arthritis Research & Therapy 2005 7:R1296   doi:10.1186/ar1824

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