方法：利用天津市滨江医院内科门诊高血压抽样调查资料进行病例对照研究。
Methods: A pair-matched case-control study was conducted with data on the sampling survey of HBP in Binjiang Hospitol from 1994 to 1996.
方法：本文对1992年-1998年天津市安康医院收治的1020例脱毒治疗者的病史资料进行了文档分析调查。
Method: Case retrospective analysis was conducted in 1020 drug abusers who were treated in Ankang hospital during 1992 to 1998.
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