根据亚特兰大疾病预防和控制中心近期的报告，美国50岁以上人中大约仅38％的人为结直肠癌筛查或诊断作过直肠镜检查。大便浴血试验比率稍高些，为48％。根据1995年的一项调查，这些较低的比率与恐惧、厌恶心理有关。没有接受过筛查的被调查者认为他们宁愿少活1个月，而不愿做乙 According to a recent report from the Centers for Disease Control and Prevention in Atlanta, only about 38% of people over the age of 50 in the United States have undergone colorectal cancer screening or have undergone proctoscopy. The stool blood test rate was slightly higher at 48%. According to a 1995 survey, these lower rates were related to fear and disgust. Respondents who have not been screened believe that they would rather stay alive for less than 1 month instead of doing B.