Table 2.
Summary of risk estimatesa for physical activity and risk of seven cancers with strong evidence, by physical activity type
| Physical Activity Type | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Leisure-time | Occupational | Household | Transportation | Walking | ||||||
| Cancer Site | N | RR (95%CI) | N | RR (95%CI) | N | RR (95%CI) | N | RR (95%CI) | N | RR (95%CI) |
| Colon | 16 | 0.82 (0.75–0.87)[18] | 15 | 0.85 (0.77–0.93)[18] | 3 | 0.85 (0.71–1.02)[58] | 3 | 0.66 (0.45–0.98)[58] | -- | -- |
| Breast | 25 | 0.87 (0.83–0.91)[19] | 7 | 0.84 (0.73–0.96)[19] | 21 | 0.78 (0.69–0.89)[11] | -- | -- | 5 | 0.87 (0.79–0.96)[19] |
| Endometrial | 22 | 0.84 (0.78–0.91)[17] | 19 | 0.81 (0.75–0.87)[17] | 7 | 0.70 (0.47–1.02)[17] | -- | -- | 10 | 0.82 (0.69–0.97)[17] |
| Kidney | 19 | 0.88 (0.77–1.00)[44] | 14 | 0.91 (0.79–1.04)[44] | -- | -- | -- | -- | -- | -- |
| Bladder | 12 | 0.81 (0.66–0.99)[16] | 8 | 0.90 (0.76–1.07)[16] | -- | -- | -- | -- | -- | -- |
| Gastric | 22 | 0.80 (0.73–0.89)[13] | 11 | 0.84 (0.70–1.02)[13] | -- | -- | -- | -- | -- | -- |
| Esophageal | 10 | 0.72 (0.63–0.83)[13] | 8 | 0.91 (0.46–1.81)[13] | -- | -- | -- | -- | -- | -- |
a
Meta-analytic hazard ratio comparing the highest to lowest physical activity categories; ‘--’ indicates no summary estimates available in studies reviewed