From: Prospective study of physical activity and risk of postmenopausal breast cancer
Variable | Quintile of total physical activity | p | ||||
---|---|---|---|---|---|---|
 | 1 | 2 | 3 | 4 | 5 |  |
Physical activity | Â | Â | Â | Â | Â | Â |
   MET-hours/week (range) | 105 to 244 | 245 to 297 | 298 to 339 | 340 to 394 | 395 to 721 |  |
   Cases | 320 | 300 | 308 | 312 | 266 |  |
   Person-years | 52,858 | 53,967 | 54,019 | 54,487 | 54,461 |  |
   Age-adjusted RR (95% CI) | 1.0 | 0.92 (0.79 to 1.08) | 0.94 (0.81 to 1.10) | 0.95 (0.82 to 1.12) | 0.81 (0.69 to 0.95) | 0.03 |
   Multivariate RR †(95% CI) | 1.0 | 0.92 (0.79 to 1.08) | 0.97 (0.83 to 1.14) | 0.98 (0.84 to 1.15) | 0.86 (0.73 to 1.01) | 0.15 |
   Multivariate RR ‡ (95% CI) | 1.0 | 0.93 (0.80 to 1.09) | 0.98 (0.84 to 1.14) | 1.00 (0.85 to 1.16) | 0.87 (0.74 to 1.02) | 0.21 |