在医疗卫生工作中,有些治疗或防治工作能在短期内收到效果,如麻疹、大叶性肺炎等,可计算其有效率,治愈率或病死率以观察效果;但有些疾病不能治愈或不能在短期内得到结果,如慢性肝炎、肺结核、尘肺及恶性肿瘤等,欲了解其远期疗效或预后,必须进行病例随访观察。在随访观察时,如例1中195例Ⅱ期宫颈癌手术病例是在15年随访中陆续进入观察 In the medical and health work, some treatments or prevention work can receive effects in a short period of time, such as measles, lobar pneumonia, etc., and their efficacy, cure rate or mortality rate can be calculated to observe the effect; but some diseases cannot be cured or cannot In the short term results, such as chronic hepatitis, tuberculosis, pneumoconiosis and malignant tumors, etc., to understand its long-term efficacy or prognosis, we must carry out follow-up observations. At the time of follow-up, as in Example 1, 195 cases of stage II cervical cancer were seen in 15 years of follow-up.