Lo Sue S T, Fan Susan Y S, Ho P C, Glasier Anna F
The Family Planning Association of Hong Kong, 9/F 130 Hennessy Road, Hong Kong SAR.
Hum Reprod. 2004 Oct;19(10):2404-10. doi: 10.1093/humrep/deh425. Epub 2004 Aug 27.
Emergency contraception (EC) can prevent pregnancy but is under-used. Advanced provision increases use but the effect on contraceptive behaviour varies.
Women aged 18-45 years, using less effective contraceptives, were randomized to either advanced provision of three courses of EC (intervention) or to obtaining each course from clinic (control). EC use and contraceptive behaviour were monitored for 1 year.
In all, 1030 women were recruited in 6 months. The mean+/-SD number of courses of EC used in intervention versus control group was 0.56+/-1.2 versus 0.20+/-0.6 (P<0.001). In the intervention group, 47% women aged <26 years used at least one course of EC compared with 23% of older women (P<0.001). The majority of women used condoms before (intervention 89%, control 91%) and during the study (89% for both groups). Consistency of contraceptive use was higher during the study (65 versus 60% of women in both groups) (P<0.001). There were 17 unplanned pregnancies, eight in the intervention group, six of whom did not use EC in the conception cycle.
Advanced provision increases EC use especially among young women in Hong Kong. Contraceptive choice and consistency of use remains the same even among young women.
紧急避孕可预防妊娠，但使用率较低。提前提供紧急避孕药物可提高其使用率，但对避孕行为的影响各不相同。
将年龄在18 - 45岁、使用低效避孕方法的女性随机分为两组，一组提前提供三个疗程的紧急避孕药物（干预组），另一组在诊所每次获取一个疗程（对照组）。对紧急避孕药物的使用情况和避孕行为进行为期1年的监测。
6个月内共招募了1030名女性。干预组与对照组使用紧急避孕药物疗程的平均数±标准差分别为0.56±1.2和0.20±0.6（P<0.001）。在干预组中，年龄<26岁的女性中有47%至少使用了一个疗程的紧急避孕药物，而年龄较大的女性这一比例为23%（P<0.001）。大多数女性在研究前（干预组89%，对照组91%）和研究期间（两组均为89%）使用避孕套。研究期间避孕措施使用的一致性更高（两组女性分别为65%和60%）（P<0.001）。共有17例意外妊娠，干预组8例，其中6例在受孕周期未使用紧急避孕药物。
提前提供紧急避孕药物可提高其使用率，尤其是在香港的年轻女性中。即使在年轻女性中，避孕方法的选择和使用的一致性仍然相同。
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