. 2015 Mar 4;17(1):40. doi: 10.1186/s13075-015-0560-2

Table 2.

Age-adjusted and multivariable-adjusted relative risk ^a of rheumatoid arthritis by leisure-time activity in the Swedish Mammography Cohort, follow-up 2003 to 2010

Exercise	Walking/bicycling
	Cases/cohort	<20 minutes/day	Cases/cohort	≥20 minutes/day
	Cases/cohort	<20 minutes/day	Cases/cohort	(median 40 to 60)
Age-adjusted
<1 hour/week	32/3,400	1.00 (reference)	14/2,370	0.57
<1 hour/week	32/3,400	1.00 (reference)	14/2,370	(0.31 to 1.07)
≥1 hour/week	37/5,369	0.70	118/18,973	0.62^b
(median 2 to 3)	37/5,369	(0.44 to 1.12)	118/18,973	(0.42 to 0.92)
Multivariable-adjusted ^a
<1 hour/week	32/3,400	1.00 (Ref)	14/2,370	0.59
<1 hour/week	32/3,400	1.00 (Ref)	14/2,370	(0.31 to 1.10)
≥1 hour/week	37/5,369	0.72	118/18,973	0.65^b
(median 2 to 3)	37/5,369	(0.45 to 1.16)	118/18,973	(0.43 to 0.96)

Data in parentheses are the 95% confidence interval. ^aAdjusted for age (continuous), smoking status (categorised as never, former, current ≤10 cigarettes per day or >10 cigarettes per day), alcohol intake (never, former, current <2 drinks per week, ≥2 drinks per week), body mass index (quartiles) and educational level (<10 years, 10–12 years, >12 years, other). ^bCorresponding to a median of 40 to 60 minutes per day of walking/bicycling and 2 to 3 hours per week of exercise.