Since childbearing desires, and trends in these desires, differ across populations, the inclusion of women who want to become pregnant in the denominator for unintended pregnancy rates complicates interpretation of intercountry differences and trends over time. To address this limitation, we propose a rate that is the ratio of the number of unintended pregnancies to the number of women wanting to avoid pregnancy; we term these conditional rates. We computed conditional unintended pregnancy rates for five-year periods from 1990 to 2019. In 2015–2019, these conditional rates per 1,000 women per year wanting to avoid pregnancy ranged from 35 in Western Europe to 258 in Middle Africa. Rates with all women of reproductive age in the denominator have concealed stark global disparities in the ability of women to avoid unintended pregnancies, and they have understated progress in regions where the fraction of women wanting to avoid pregnancy has increased.

中文翻译：

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想要避免怀孕的女性的愿望和结果之间的一致性：“条件性”意外怀孕率的全球比较研究

由于生育愿望和这些愿望的趋势因人口而异，因此将想要怀孕的女性纳入意外怀孕率的分母中会使对国家间差异和随时间变化趋势的解释变得复杂。为了解决这一局限性，我们提出了一个比率，即意外怀孕人数与想要避免怀孕的女性人数之比；我们称这些条件利率。我们计算了 1990 年至 2019 年五年期间的条件性意外怀孕率。在 2015 年至 2019 年，这些条件性意外怀孕率从西欧的 35 人到中非的 258 人不等。以所有育龄妇女为分母的比率掩盖了全球妇女在避免意外怀孕能力方面的明显差异，