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)。
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)。
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