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The independent variable was neighborhood income, defined as mean household neighborhoodincome quintiles. Multiple logistic regression analysis was used to compute adjusted odds ratios (AORs) and 95% confidence intervals (CIs). Differences by income levels were found in twin maternities but not in higher order maternities. Twin maternities were more likely to occur in the richest neighborhood-income quintile compared to the rest of the population (AOR: 1.25, 95% CI: 1.10-1.41), after adjustment for potential confounders. The positive association between high neighborhood income and twin maternities found in this study suggests that the richest neighborhoods select families whose characteristics pose them at increased risk of having twins. Further studies are needed to clarify the underlying mechanisms leading to socioeconomic differences in multiple births.<\/jats:p>","DOI":"10.1375\/twin.10.2.400","type":"journal-article","created":{"date-parts":[[2007,4,26]],"date-time":"2007-04-26T17:37:34Z","timestamp":1177609054000},"page":"400-405","source":"Crossref","is-referenced-by-count":5,"title":["Multiple Maternities and Neighborhood Income"],"prefix":"10.1017","volume":"10","author":[{"given":"Marcelo Luis","family":"Urquia","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"John William","family":"Frank","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Richard Henry","family":"Glazier","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Rahim","family":"Moineddin","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"56","published-online":{"date-parts":[[2012,2,21]]},"reference":[{"key":"p_1_411","doi-asserted-by":"publisher","DOI":"10.1053\/sper.2002.34775"},{"key":"p_2_412","doi-asserted-by":"crossref","first-page":"1323","DOI":"10.2105\/AJPH.92.8.1323","volume":"92","author":"Blondel B.","year":"2002","journal-title":"American Journal of Public Health"},{"key":"p_3_413","doi-asserted-by":"publisher","DOI":"10.1093\/humupd\/5.2.179"},{"key":"p_4_414","doi-asserted-by":"crossref","unstructured":"Campbell, D. 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