Table 3.

Prevalence odds ratios for the associations between selected risk factors and arthritis, OA and RA

Risk factors	Arthritis (95 % CI)	OA (95 % CI)a	RA (95 % CI)b
BMI	1.1 (1.03, 1.1)*	1.01 (1.06, 1.15)*	1.0 (0.9, 1.1)
Wealth	0.9 (0.8, 0.9)*	1.1 (0.9, 1.1)	0.9 (0.7, 1.1)
Static mechanical stress	0.7 (0.5, 0.9)*	0.1 (0.7, 1.3)	0.3 (0.1, 0.6)*
Dynamic mechanical stress	1.0 (0.9, 1.2)	1.1 (0.9, 1.3)	1.0 (0.7, 1.4)
Smoking	0.7 (0.4, 1.3)	0.1 (0.5, 1.9)	0.4 (0, 3.0)

BMI Body mass index, OA osteoarthritis, RA rheumatoid arthritis

^aAdjusted by age and gender

^bFirth logistic regression and profile penalized likelihood confidence intervals

*Significant at α = 0.05