Methods The areas of KBD were stratified into three prevailing levels which were of low ,moderate and high prevalence according to the 1978 surveillance data.

• 方法将1978年全民普查临床患病率分为轻、中、重病情三层；每层随机抽取1/3的行政村；进行全民大骨节病临床检查和流行病学调查。结果临床检查25656人；检出大骨节病患者3489例；患病率13.；6%25。