Skip to main content

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.