Physical activity, water intake and risk of colorectal cancer in Taiwan: A hospital-based case-control study

✍ Scribed by Reiping Tang; Jeng-Yi Wang; Sing-Kai Lo; Ling-Ling Hsieh

• Publisher: John Wiley and Sons
• Year: 1999
• Tongue: French
• Weight: 91 KB
• Volume: 82
• Category: Article
• ISSN: 0020-7136
• DOI: 10.1002/(sici)1097-0215(19990812)82:4<484::aid-ijc3>3.0.co;2-a

✦ Synopsis

The age-adjusted mortality rates of colorectal cancer have been rising in Taiwan over the past 2 decades, and colorectal cancer is now the third leading cause of cancer mortality in the country. We conducted a hospital-based case-control study to clarify the nature of the association between physical activity, water intake and colorectal-cancer risk in Taiwan. A total of 163 subjects (aged 33-80 years) with histologically confirmed primary colorectal cancer and 163 hospital controls were enrolled during 1992. Dietary intake, physical activity and other lifestyle activities were assessed using a comprehensive food-frequency and lifestyle-activity questionnaire. Adjusted odds ratios (OR) and 95% confidence intervals (CI) were estimated using conditional logistic-regression analysis. A strong inverse dose-response relation between increased water intake and rectal cancer was found among men after adjustment for other risk factors ( p for trend ‫؍‬ 0.0005). The OR for rectal cancer among men in the highest tertile of water intake was 0.08 (95% CI, 0.02-0.35) compared with that among men in the lowest tertile (OR ‫؍‬ 1). Similar but not significant trends were seen among women (p ‫؍‬ 0.29). The OR for colon cancer among men with active leisure-time physical activity was 0.19 (95% CI, 0.05-0.77) times that among sedentary men (p for trend ‫؍‬ 0.03). However, physical activity was not associated with colon-cancer risk among women (p ‫؍‬ 0.48). No differences in the amount of water intake were found related to level of physical activity. These findings add to the evidence that leisure-time activity may reduce colon-cancer risk, not only in high-risk but also in low-risk populations, and support the potential beneficial effect of increased water intake in reducing colorectal-cancer risk.