The study included 2397 patients with baseline hypertension: 1191 in 20 intervention facilities and 1206 in 20 control facilities.

该研究包括2397例符合基本条件的高血压患者，其中1191例在20个干预机构，而另外的1206例则在20个对照机构。

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American Stop Smoking Intervention Study for Cancer prevention (ASSIST), largest tobacco prevention and control project in the United States, launched.

美国最大的烟草预防和控制计划-美国禁烟防癌干预研究(ASSIST)启动。

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Methods: Based on prospective cohort study design, 225 schizophrenic patients were randomly divided into intervention group and control group, and were followed up for two years.

方法：采用前瞻性研究，把2 2 5例精神分裂症患者随机分入干预组和对照组进行历时二年的随访研究。

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