Table 3.
Hazard ratio for incident atrial fibrillation according to quartiles of total physical activity.
| Physical activity (METs/day) | |||||
|---|---|---|---|---|---|
| Q1 | Q2 | Q3 | Q4 | ||
| No. with AF | 51 (2.3%) | 38 (1.9%) | 31 (1.4%) | 47 (2.1%) | |
| Incidence rate | 2.39 | 1.91 | 1.42 | 2.12 | |
| Crude | HR (95% CI) | 1 | 0.79 (0.52–1.20) | 0.59 (0.38–0.92) | 0.87 (0.59–1.29) |
| p-value | 0.263 | 0.020 | 0.489 | ||
| Model 1 | HR (95% CI) | 1 | 0.78 (0.51–1.20) | 0.58 (0.37–0.91) | 0.84 (0.54–1.30) |
| p-value | 0.255 | 0.017 | 0.425 | ||
| Model 2 | HR (95% CI) | 1 | 0.79 (0.52–1.21) | 0.59 (0.38–0.92) | 0.90 (0.58–1.39) |
| p-value | 0.273 | 0.021 | 0.622 | ||
| Model 3 | HR (95% CI) | 1 | 0.78 (0.51–1.19) | 0.58 (0.37–0.90) | 0.88 (0.57–1.36) |
| p-value | 0.246 | 0.016 | 0.564 | ||
Model 1: adjusted for age, sex, residence, education.
Model 2: Model 1 + BMI, comorbidity, alcohol and smoking.
Model 3: Model 2 + RHR.
AF, atrial fibrillation; Incidence rate, per 1,000 person-years; HR, hazard ratio; CI, confidence interval; BMI, body mass index; RHR, resting heart rate.