Table 3.
Physical Activity and Colorectal Cancer Risk in the Singapore Chinese Health Study, 1993–2014; by Time Spent Sitting Watching Television
| Time Spent Sitting Watching Television | ≤2 hrs/day (n=37,607) | ≥3 hrs/day (n=23,714) | ||
|---|---|---|---|---|
| Cases, n | HR (95% CI)a | Cases, n | HR (95% CI)a | |
| Moderate Intensity | ||||
| None | 884 | 1.0 (ref) | 620 | 1.0 (ref) |
| Any (≥ ½ hrs/week) | 292 | 1.08 (0.94–1.24) | 185 | 0.86 (0.72–1.01) |
| P interaction | 0.042 | |||
| Strenuous-Vigorous Intensity | ||||
| None | 1020 | 1.0 (ref) | 742 | 1.0 (ref) |
| Any (≥ ½ hrs/week) | 156 | 0.88 (0.74–1.05) | 63 | 0.79 (0.61–1.04) |
| P interaction | 0.51 | |||
| Overall Physical Activity Level b | ||||
| None | 757 | 1.0 (ref) | 572 | 1.0 (ref) |
| Low | 263 | 1.11 (0.96–1.28) | 170 | 0.84 (0.70–0.99)* |
| Medium | 127 | 0.93 (0.76–1.13) | 48 | 0.74 (0.55–1.00) |
| High | 29 | 0.82 (0.57–1.20) | 15 | 0.81 (0.48–1.36) |
| P for trend | 0.54 | 0.013 | ||
| P interaction | 0.10 | |||
a
Hazard ratios (HRs) were adjusted for age, dialect group, interview year, education level, BMI, sex, cigarette smoking, alcohol use, sleep, dietary fiber, family history of colorectal cancer, and diabetes.
b
Low: Moderate Physical Activity Only (≥1/2 hr/week); Medium: Strenuous-Vigorous Physical Activity Only (≥1/2 hr/week); High: Moderate and Strenuous-Vigorous Physical Activity (≥1hr/week)
*
p<0.05