From: Prospective study of physical activity and risk of postmenopausal breast cancer
Variable | No. of cases | Category of physical activity | P-value, test for trend | P-value, test for interaction | ||||
---|---|---|---|---|---|---|---|---|
 |  | 1 | 2 | 3 | 4 | 5 |  |  |
 |  | Total physical activity |  |  | ||||
Body mass index | Â | Â | Â | Â | Â | Â | Â | Â |
   < 25.0 kg/m2 | 876 | 1.0 | 0.88 (0.71 to 1.08) | 0.92 (0.75 to 1.12) | 0.91 (0.74 to 1.11) | 0.76 (0.61 to 0.94) | 0.03 |  |
   ≥ 25.0 kg/m2 | 630 | 1.0 | 1.01 (0.79 to 1.29) | 1.07 (0.84 to 1.37) | 1.12 (0.88 to 1.43) | 1.06 (0.82 to 1.36) | 0.48 | 0.19 |
 |  | Vigorous physical activity |  |  | ||||
Body mass index | Â | Â | Â | Â | Â | Â | Â | Â |
   < 25.0 kg/m2 | 876 | 1.0 | 0.87 (0.72 to 1.07) | 0.81 (0.67 to 0.99) | 0.90 (0.73 to 1.10) | 0.68 (0.54 to 0.85) | 0.002 |  |
   ≥ 25.0 kg/m2 | 630 | 1.0 | 1.15 (0.91 to 1.46) | 1.00 (0.79 to 1.27) | 0.93 (0.72 to 1.21) | 1.18 (0.93 to 1.49) | 0.33 | 0.008 |
 |  | Non-vigorous physical activity |  |  | ||||
Body mass index | Â | Â | Â | Â | Â | Â | Â | Â |
   < 25.0 kg/m2 | 876 | 1.0 | 0.97 (0.79 to 1.20) | 1.05 (0.85 to 1.31) | 0.97 (0.78 to 1.20) | 0.98 (0.79 to 1.21) | 0.85 |  |
   ≥ 25.0 kg/m2 | 630 | 1.0 | 1.01 (0.79 to 1.28) | 0.90 (0.69 to 1.16) | 0.98 (0.77 to 1.27) | 1.09 (0.85 to 1.39) | 0.59 | 0.47 |