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For example, the Kaplan\u2013Meier technique has been used to summarize the results of controlled clinical trials of alternative devices and the logrank test used to make any comparisons. A particular feature of IUD studies is the large number of possible causes of failure (reasons for discontinuation of the device). These lead to considerations of competing risks, where in this framework, the discontinuations are considered as competing causes of contraceptive failure. In this context, we compare the net and crude probability estimates of discontinuation rates using continuous time and argue for the routine use of the latter. We use data from a randomized multi\u2010centre trialon the long\u2010term safety and efficacy of two IUDs, TCu220C and TCu380A, for illustration. Copyright \u00a9 2001 John Wiley &amp; Sons, Ltd.<\/jats:p>","DOI":"10.1002\/sim.1079","type":"journal-article","created":{"date-parts":[[2002,8,25]],"date-time":"2002-08-25T16:24:03Z","timestamp":1030292643000},"page":"3589-3600","source":"Crossref","is-referenced-by-count":11,"title":["A competing risk approach to the analysis of trials of alternative intra\u2010uterine devices (IUDs) for fertility regulation"],"prefix":"10.1002","volume":"20","author":[{"given":"Bee\u2010Choo","family":"Tai","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Alexander","family":"Peregoudov","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"David","family":"Machin","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"311","published-online":{"date-parts":[[2001,11,26]]},"reference":[{"key":"e_1_2_1_2_2","doi-asserted-by":"publisher","DOI":"10.1111\/j.0006-341X.2000.0971.x"},{"key":"e_1_2_1_3_2","doi-asserted-by":"publisher","DOI":"10.2307\/2060159"},{"key":"e_1_2_1_4_2","doi-asserted-by":"publisher","DOI":"10.2307\/1964831"},{"key":"e_1_2_1_5_2","doi-asserted-by":"publisher","DOI":"10.2307\/1964828"},{"key":"e_1_2_1_6_2","doi-asserted-by":"crossref","first-page":"187","DOI":"10.1111\/j.2517-6161.1972.tb00899.x","article-title":"Regression models and life tables (with discussion)","volume":"34","author":"Cox DR","year":"1972","journal-title":"Journal of the Royal Statistical Society, Series B"},{"key":"e_1_2_1_7_2","doi-asserted-by":"publisher","DOI":"10.1038\/bjc.1976.220"},{"key":"e_1_2_1_8_2","doi-asserted-by":"publisher","DOI":"10.1038\/bjc.1977.1"},{"key":"e_1_2_1_9_2","doi-asserted-by":"publisher","DOI":"10.1002\/sim.4780050512"},{"key":"e_1_2_1_10_2","unstructured":"PotterRG.The multiple decrement life table as an approach to the measurement of use effectiveness and demographic effectiveness of contraception. 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