1984年以来每隔8年进行一次的调查是为了掌握国民接受诊治的情况。调查对象为不同都道府县的医疗机构,医院的抽样率为1/10。1987年的抽样为1/3。调查是从某日开始计算正在住院的病人及门诊病人,所以不能把调查结果做为判断需要的依据,如调查日由于下大雨门诊病人会减少,或因床位不足而影响入院率。调查时正确的疾病分类很重要,调查表上有 The survey has been conducted every eight years since 1984 to investigate the situation of people being treated by the nation. The respondents were medical institutions in different prefectures and counties, and the hospital sampling rate was 1/10. In 1987, the sampling rate was 1/3. The survey is based on the calculation of hospitalized patients and outpatients from a certain date. Therefore, the results of the survey cannot be used as a basis for judgments. For example, the number of outpatients due to heavy rains on the survey day may be reduced or the rate of hospitalization may be affected due to lack of beds. The correct classification of the disease at the time of the investigation is very important.