Methods: With randomly stratified cluster sampling method, 600 elderly were selected in Tangshan and the subjects were examined clinically. 1Etabase was created and analyzed by SAS8.0.
Methods: With randomly stratified cluster sampling method, 600 elderly were selected in Tangshan and the subjects were examined clinically. 1Etabase was created and analyzed by SAS8.0.
方法：采用分层随机抽样方法，对唐山市600名40岁以上中老年人进行口腔健康检查，数据应用SAS8.0软件进行单因素分析。