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 risk^a	95% confidence interval	Relative risk^b	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.

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