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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

From: Physical activity and risk of rheumatoid arthritis in women: a population-based prospective study

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