【摘要】 报告四种节育措施的正效益、负效益,其计算方法及其他学者的比较,分析了筛选的效益的显著影响因素。更多还原

【Abstract】 This paper reports the positive and negative efficiencies of four kinds of birth control measures and their calculating method compared to that of other authors and significantly affecting factors of the screened efficiency were analyged.Author’ s address Shandong University of Medical Sciencies; Shandong Family Planning Institute and Qingdao Burean of Public Health.更多还原