All data were collected through direct interview. The gathered data were analyzed by methods of matched and unmatched studies in IBM computer, and expressed by odds ratio (OR).
直接面询收集的资料用IBM微机处理，主要用成组和非成组分析方法计算比数比(OR值)。
On the bases of the work of a superposed energy type ignition system and its circuits analysis, a series of experimental studies on the matched engine have been done.
在能量叠加点火系电路分析的基础上，对其进行了匹配发动机的试验研究。
The other two studies examined the cancer risk and smoking habits of current and former smokers, with and without cancer, with a carefully matched control group of never-smokers.
另外两组研究对当前的或过去的烟民吸烟习惯和患癌症的危险，患上癌症和未患上癌症等情况与非烟民的相关情况仔细地对比。
Well-designed, prospective experimental studies with appropriately matched controls are needed.
需要设计良好的、前瞻性及适当的配对对照的实验性研究。
Well-designed, prospective experimental studies with appropriately matched controls are needed.
需要设计良好的、前瞻性及适当的配对对照的实验性研究。
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