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Table 1 Baseline characteristics of 30,112 women from the Swedish Mammography Cohort, 1997, by leisure-time activity

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

  Leisure-time activity
  Low Intermediate High
  Walking Walking Walking Walking
<20 minutes/day <20 minutes/day ≥20 minutes/day ≥20 minutes/day a
Exercise Exercise Exercise Exercise
<1 hour/week ≥1 hour/week <1 hour/week ≥1 hour/week a
Cases 32 37 14 118
Cohort 3,400 5,369 2,370 18,973
Age (years) 61.6 (9.4) 61.3 (9.0) 59.8 (8.7) 61.3 (8.7)
Years of education (>12 years, %) 15.8 19.9 23.4 19.8
Body mass index (kg/m2) 26.2 (4.67) 25.5 (4.11) 24.9 (3.89) 24.7 (3.60)
Current smokers (%) 30.7 23.5 27.6 20.0
Alcohol drinkers (%) 77.9 83.5 84.0 85.0
  1. Data presented as number, mean (standard deviation) or percentage. aMedian of walking/bicycling in the category ≥20 was 40 to 60 minutes per day; median of exercise in the category ≥1 was 2 to 3 hours per week.