Table 1

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

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.

aRF status unknown for one unexposed case.

bAdjusted for age and residential area.

cAdjusted for age, residential area and smoking.

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

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