不少人认为,排便间期长、粪块小而硬者,大肠癌、息肉、憩室炎等罹病率增高。著者对大肠癌发病率高的夏威夷日本侨民和发病率低的日本本国居民进行了粪便排出的对比观察。令吞服内盛钡剂的微小塑料球,借X光检查连续五天的排便速度(以排出80％以上塑料球计算肠道运送时间),同时称量粪重得每天平均值。 Many people believe that the long-term defecation period, small and hard stool, colorectal cancer, polyps, diverticulitis and other delirium increased. The authors compared the excretion of feces in Hawaiian Japanese expatriates with high incidence of colorectal cancer and Japanese residents with low incidence. In order to swallow the tiny plastic ball containing the tincture, X-ray examination of the defecation speed for five consecutive days (to discharge more than 80% of the plastic ball to calculate the intestinal transit time), while weighing the feces to get the daily average.