Relative risks (RR) (95% CI) of atrial fibrillation by categories of exercise and walking/bicycling in the Swedish Mammography Cohort, 1998–2009
| Cases* | Age-adjusted RR | Multivariable RR† | |
|---|---|---|---|
| Exercise at study entry (h/week) | |||
| <1 | 555 | 1.00 (reference) | 1.00 (reference) |
| 1 | 564 | 0.85 (0.75–0.95) | 0.89 (0.79–1.00) |
| 2−3 | 888 | 0.84 (0.75–0.93) | 0.92 (0.82–1.02) |
| ≥4 | 601 | 0.75 (0.67–0.84) | 0.85 (0.75–0.95) |
| p For trend | <0.0001 | 0.02 | |
| Walking/bicycling at study entry (min/day) | |||
| Almost never | 421 | 1.00 (reference) | 1.00 (reference) |
| <20 | 524 | 0.88 (0.78–1.01) | 0.94 (0.82–1.07) |
| 20−39 | 880 | 0.77 (0.68–0.89) | 0.86 (0.76–0.97) |
| ≥40 | 937 | 0.71 (0.63–0.80) | 0.81 (0.72–0.92) |
| p For trend | <0.0001 | 0.0002 | |
*The sum does not add up to the total owing to missing data for the exposure variable.
†Multivariable models were adjusted for age, education (primary school, high school, university), smoking status and pack-years of smoking (never smoker, past smoker and <20 pack-years; past smoker and 20–39 pack-years, past smoker and ≥40 pack-years, current smoker and <20 pack-years, current smoker and 20–39 pack-years, current smoker and ≥40 pack-years), body mass index (<23.0, 23.0–24.9, 25.0–29.9, ≥30 kg/m2), diabetes (yes/no), history of hypertension (yes/no), history of coronary heart disease or heart failure (yes/no), family history of myocardial infarction (yes/no) and alcohol consumption (never drinkers, past drinkers and current drinkers of <1 drink/day, 1–2 drinks/day and ≥3 drinks/day).