Family planning measures for unmarried women are based on contraceptive demand and use among sexually active women. Sexual activity status is commonly defined based on comparing reported time-since-last-sex to a cutoff time, with women defined to be sexually active if their most recent sex was within the last four weeks. While easy to understand and compute, this approach to constructing family planning measures results in a limited understanding of family planning and exposure to unintended pregnancy because it cannot comprehensively capture the frequency of sex at the population level. We propose a new statistical approach to quantify sexual activity, using reported time-since-last-sex data. Based on estimated frequencies of sex among users and nonusers in need of family planning, we propose new family planning measures, including the ratio of protected exposure over all women's exposure to risk of unintended pregnancy.

中文翻译：

---

基于性活动和避孕药具使用数据的计划生育和暴露妊娠风险的新措施

针对未婚妇女的计划生育措施是基于性活跃妇女对避孕药具的需求和使用情况。性活动状态通常是根据报告的自上次性行为以来的时间与截止时间的比较来定义的，如果最近的性行为发生在过去四个星期内，则女性被定义为性活跃。虽然易于理解和计算，但这种构建计划生育措施的方法导致对计划生育和意外怀孕的了解有限，因为它无法全面捕捉人口层面的性行为频率。我们提出了一种新的统计方法来量化性活动，使用报告的自上次性行为以来的时间数据。根据估计需要计划生育的用户和非用户的性生活频率，我们提出新的计划生育措施，