搜索结果: 1-2 共查到“人口统计学 Contraceptive Failure”相关记录2条 . 查询时间(0.064 秒)
Contraceptive Failure, Method-Related Discontinuation And Resumption of Use：Results from the 1995 National Survey of Family Growth
Contraceptive Failure pregnancies United States unintended
2009/9/15
Context: Half of all pregnancies in the United States are unintended. Of these, half occur to women who were practicing contraception in the month they conceived, and others occur when couples stop us...
Contraceptive Failure Rates：New Estimates From the 1995 National Survey of Family Growth
Contraceptive Failure Rates 1995 Family Growth
2009/9/15
Context: Unintended pregnancy remains a major public health concern in the United States. Information on pregnancy rates among contraceptive users is needed to guide medical professionals' recommendat...