Usage of skin care products and risk of rheumatoid arthritis: results from the Swedish EIRA study

Table 3 Relative risk of developing rheumatoid arthritis for subjects reporting exposure to cosmetics

Exposure	Number of exposed cases/controls	Relative risk^a	95% confidence interval	Relative risk^b	95% confidence interval
Women
A	104/118	1.0	Reference	1.0	Reference
B	178/174	1.1	0.8 to 1.6	1.0	0.7 to 1.5
C	178/230	0.9	0.6 to 1.2	0.8	0.6 to 1.2
D	319/370	1.0	0.7 to 1.3	0.9	0.6 to 1.2
E	233/294	0.9	0.6-1.2	0.8	0.5 to 1.1
Men
A	315/359	1.0	Reference	1.0	Reference
B	53/78	0.7	0.5 to 1.1	0.8	0.5 to 1.2
C	22/27	0.8	0.5 to 1.5	0.9	0.5 to 1.6
D	12/13	1.1	0.5 to 2.5	1.1	0.5 to 2.5
E	4/6	0.9	0.2 to 3.2	0.6	0.1 to 2.6
All
A	419/477	1.0	Reference	1.0	Reference
B	231/252	0.9	0.7 to 1.2	0.9	0.7 to 1.2
C	200/257	0.9	0.7 to 1.2	0.8	0.6 to 1.1
D	331/383	1.0	0.7 to 1.3	0.9	0.7 to 1.2
E	237/300	0.9	0.6 to 1.2	0.8	0.5 to 1.1

Relative risk together with 95% confidence interval of developing rheumatoid arthritis overall for subjects 18 to 70 years old reporting different amounts of exposure to cosmetics compared with those low exposed (A), by gender.
^aAdjusted for age, living area and gender where appropriate. ^bAdjusted for age, living area, gender, socio-economic status and smoking where appropriate.