STUDY OBJECTIVE To investigate the reasons for discontinuation of the last contraceptive method used among adolescent women with a current unintended pregnancy. DESIGN Demographic and health, cross-sectional, surveys. SETTING Thirty-five low- and middle-income countries. PARTICIPANTS We selected 2173 girls aged 15-19 years with a current unintended pregnancy, using a multistage cluster random sampling method. INTERVENTIONS A questionnaire administered by trained interviewers, which included sociodemographic as well as individual maternal and contraceptive history, was used to collect data. MAIN OUTCOME MEASURES The prevalence of contraception utilization and the contribution of each reason for contraceptive discontinuation before the current unintended pregnancies. RESULTS Almost three-quarters of adolescent women were not using any contraception before the current unintended pregnancy, and less than 1 in 100 was using a long-acting modern method. Among girls who last used a traditional method, 111/150 (74.0%) discontinued because of failure. Among girls who last used a long-acting modern method, 7/11 (63.6%) discontinued because of health concerns and side effects. CONCLUSION This study highlights that approximately 80.0% of adolescent women with an unintended pregnancy in 35 low- and middle-income countries were either nonusers or using traditional methods. An additional 20.4% were using a short-acting modern method. Long-acting methods would have prevented the overwhelming majority of unintended pregnancies, including the vast numbers from contraceptive failure.

中文翻译：

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低收入和中等收入国家的意外怀孕的青春期妇女：中止避孕的原因。

目的探讨目前意外怀孕的青春期妇女中止使用最后一种避孕方法的原因。设计人口与健康，横断面，调查。设置35个中低收入国家。参与者我们采用多阶段整群随机抽样方法，选择了2173名15-19岁当前意外怀孕的女孩。干预措施由受过训练的访调员管理的问卷包括社会人口统计学资料以及单独的孕产妇和避孕史，用于收集数据。主要观察指标在当前意外怀孕之前，避孕药具的使用率以及避孕药具终止的各种原因的贡献。结果在目前的意外怀孕之前，将近四分之三的青春期妇女没有使用任何避孕措施，并且使用长效现代方法的妇女不到100名。在上次使用传统方法的女孩中，有111/150（74.0％）因失败而停药。在上次使用长效现代方法的女孩中，有7/11（63.6％）因健康问题和副作用而停药。结论这项研究强调，在35个低收入和中等收入国家中，有意外怀孕的青春期妇女中约有80.0％是不使用或使用传统方法。另外有20.4％使用的是短效现代方法。长效方法可以防止绝大多数意外怀孕，包括大量避孕失败。