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Table 3 Relative risk of rheumatoid arthritis by different activity status among women from the Swedish Mammography Cohort, follow-up 2003 to 2010

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

  Person-years Number of cases a /women in the cohort Age-adjusted relative risk 95% CI Multivariable b relative risk 95% CI
Leisure-time activity
Walking/bicycling       
<20 minutes/day 64,615 69/8,769 1.00   1.00  
≥20 minutes/day (median 40 to 60) 161,862 132/21,343 0.91 0.76 to 1.08 0.91 0.77 to 1.09
Exercise       
<1 hour/week 42,398 46/5,770 1.00   1.00  
1 hour/week 54,190 48/7,150 0.80 0.54 to 1.20 0.83 0.55 to 1.25
≥2 hours/week (median 2 to 3) 129,889 107/17,192 0.77 0.55 to 1.10 0.80 0.56 to 1.14
Leisure-time inactivity
Watching television/sitting       
<1 hour/day 25,361 21/3,280 1.00   1.00  
1 to 2 hours/day 104,213 93/13,665 1.15 0.71 to 1.84 1.11 0.69 to 1.78
>2 hours/day (median 3 to 4) 95,068 87/12,922 1.37 0.84 to 2.24 1.27 0.77 to 2.08
Other daily physical activities
Home/household work       
<2 hours/day 86,311 83/11,364 1.00   1.00  
3 to 4 hours/day 77,696 74/10,344 1.05 0.76 to 1.43 1.04 0.75 to 1.43
5 to 6 hours/day 33,313 24/4,458 0.84 0.53 to 1.33 0.84 0.53 to 1.35
>6 hours/day (median 7 to 8) 22,131 13/2,981 0.67 0.37 to 1.22 0.68 0.37 to 1.24
Work/occupation       
Sitting 107,145 103/14,290 1.00   1.00  
Walking/standing 105,432 87/13,917 0.86 0.64 to 1.14 0.85 0.63 to 1.13
Total energy expenditure (24 hours)
<38.8 MET-hours per day 48,847 45/6,567 1.00   1.00  
38.8 to 42.2 MET-hours per day 51,492 47/6,792 1.00 0.66 to 1.50 1.01 0.67 to 1.53
42.2 to 45.9 MET-hours per day 51,285 44/6,800 0.94 0.62 to 1.43 0.96 0.63 to 1.46
≥45.9 MET-hours per day 52,099 46/6,851 0.97 0.64 to 1.46 0.97 0.64 to 1.47
  1. CI, confidence interval; MET, metabolic equivalent (kcal/kg per hour). aNumber of cases do not add to the total (n = 201) due to missing values for information about the single physical activities. bAdjusted 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).