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I then examine the strengths and weaknesses of some of the analysis strategies in current use, both in situations where the study group is homogeneous and where there are high\u2010risk women present. I show that the concept of habitual aborter is not useful and can be misleading, and I suggest that one take a broader view of heterogeneity.<\/jats:p>","DOI":"10.1002\/sim.4780050602","type":"journal-article","created":{"date-parts":[[2007,4,24]],"date-time":"2007-04-24T16:02:40Z","timestamp":1177430560000},"page":"557-564","source":"Crossref","is-referenced-by-count":10,"title":["On the role of \u2018habitual aborters\u2019 in the analysis of spontaneous abortion"],"prefix":"10.1002","volume":"5","author":[{"given":"Beth C.","family":"Gladen","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2006,10,12]]},"reference":[{"key":"e_1_2_1_2_2","doi-asserted-by":"publisher","DOI":"10.1093\/oxfordjournals.aje.a112953"},{"key":"e_1_2_1_3_2","doi-asserted-by":"crossref","first-page":"481","DOI":"10.1093\/oxfordjournals.aje.a113329","article-title":"Re: \u201cMenarcheal age and spontaneous abortion: a causal connection\u201d?","volume":"115","author":"Casagrande J. 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H.","year":"1963","journal-title":"American Journal of Human Genetics"},{"key":"e_1_2_1_11_2","article-title":"Estimation of spontaneous abortion rates","volume":"6","author":"Gladen B. C.","year":"1975","journal-title":"Stanford Biostatistics Technical Report"},{"key":"e_1_2_1_12_2","doi-asserted-by":"publisher","DOI":"10.2307\/2173613"},{"key":"e_1_2_1_13_2","doi-asserted-by":"publisher","DOI":"10.1016\/0378-3782(82)90135-9"},{"key":"e_1_2_1_14_2","doi-asserted-by":"publisher","DOI":"10.2307\/2529950"},{"key":"e_1_2_1_15_2","doi-asserted-by":"publisher","DOI":"10.1016\/0378-3782(78)90041-5"},{"key":"e_1_2_1_16_2","volume-title":"A generalized model for analysis of nonindependent observations","author":"Kissling G. 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