{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,4,29]],"date-time":"2026-04-29T10:16:46Z","timestamp":1777457806404,"version":"3.51.4"},"reference-count":25,"publisher":"SAGE Publications","issue":"3","license":[{"start":{"date-parts":[[2012,8,28]],"date-time":"2012-08-28T00:00:00Z","timestamp":1346112000000},"content-version":"tdm","delay-in-days":0,"URL":"https:\/\/journals.sagepub.com\/page\/policies\/text-and-data-mining-license"}],"content-domain":{"domain":["journals.sagepub.com"],"crossmark-restriction":true},"short-container-title":["Obstet Med"],"published-print":{"date-parts":[[2012,9]]},"abstract":"<jats:sec><jats:title>Objective<\/jats:title><jats:p> To analyse the dose-dependent effect of body mass index (BMI) categories for common pregnancy outcomes. <\/jats:p><\/jats:sec><jats:sec><jats:title>Methods<\/jats:title><jats:p> A retrospective cohort study of all deliveries that occurred between 1 January 2005 and 31 December 2009 in a tertiary maternity centre, in Sydney Australia. Common pregnancy outcomes were analysed against World Health Organization (WHO) BMI categories using multiple logistic regression analysis. <\/jats:p><\/jats:sec><jats:sec><jats:title>Results<\/jats:title><jats:p> From a total of 18,304 pregnancies, 9087 singleton pregnancies with complete data-sets were identified. Of these pregnancies, 4000 (44%) had a normal BMI, 470 (5.2%) were underweight, 2293 (25.2%) were overweight, 1316 (14.5%) were obese class I, 630 (6.9%) were obese class II and 378 (4.2%) were obese class III. Using the normal BMI category as the reference, there was a clear dose effect of BMI categories for hypertension ( P &lt; 0.001), pre-eclampsia ( P &lt; 0.001), caesarean section ( P &lt; 0.001), macrosomia ( P &lt; 0.001), large for gestational age ( P &lt; 0.001), small for gestational age ( P &lt; 0.001) and neonatal respiratory distress ( P = 0.039). In contrast, despite a significant association with BMI ( P &lt; 0.001), a dose-dependent effect was not found for gestational diabetes. <\/jats:p><\/jats:sec><jats:sec><jats:title>Conclusion<\/jats:title><jats:p> The results of our study have important clinical significance as the data, using WHO BMI categories, more accurately help stratify risk assessment in a clinically relevant dose-dependent relationship. <\/jats:p><\/jats:sec>","DOI":"10.1258\/om.2012.110091","type":"journal-article","created":{"date-parts":[[2012,8,29]],"date-time":"2012-08-29T01:10:42Z","timestamp":1346202642000},"page":"112-118","update-policy":"https:\/\/doi.org\/10.1177\/sage-journals-update-policy","source":"Crossref","is-referenced-by-count":14,"title":["Association between World Health Organization categories of body mass index and relative risks for weight-related pregnancy outcomes: a retrospective cohort study"],"prefix":"10.1258","volume":"5","author":[{"given":"Katrina","family":"Zaballa","sequence":"first","affiliation":[{"name":"Chair of School of Paediatrics"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Anthony","family":"Liu","sequence":"additional","affiliation":[{"name":"Chair of School of Paediatrics"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Michael John","family":"Peek","sequence":"additional","affiliation":[{"name":"Discipline of Obstetrics, Gynaecology and Neonatology, Sydney Medical School Nepean, The University of Sydney, Nepean Hospital Penrith, NSW 2751, Australia"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Max","family":"Mongelli","sequence":"additional","affiliation":[{"name":"Discipline of Obstetrics, Gynaecology and Neonatology, Sydney Medical School Nepean, The University of Sydney, Nepean Hospital Penrith, NSW 2751, Australia"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Ralph","family":"Nanan","sequence":"additional","affiliation":[{"name":"Chair of School of Paediatrics"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"179","published-online":{"date-parts":[[2012,8,28]]},"reference":[{"key":"bibr-OM-11-0091-CPC1","unstructured":"World Health Organisation (WHO). 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C-Obs 7 Diagnosis of Gestational Diabetes Mellitus. Melbourne, Australia: RANZCOG. See http:\/\/www.ranzcog.edu.au\/publications\/statements\/C-obs7.pdf (udated June 2008; last checked 30 May 2011)"},{"key":"bibr-OM-11-0091-CPC18","doi-asserted-by":"publisher","DOI":"10.1016\/j.bpobgyn.2009.06.003"},{"key":"bibr-OM-11-0091-CPC19","doi-asserted-by":"publisher","DOI":"10.1111\/j.1479-828X.2007.00698.x"},{"key":"bibr-OM-11-0091-CPC20","doi-asserted-by":"publisher","DOI":"10.3109\/14767050903550899"},{"key":"bibr-OM-11-0091-CPC21","doi-asserted-by":"publisher","DOI":"10.1111\/j.1471-0528.2010.02823.x"},{"key":"bibr-OM-11-0091-CPC22","doi-asserted-by":"publisher","DOI":"10.1007\/s00431-009-1107-9"},{"key":"bibr-OM-11-0091-CPC23","doi-asserted-by":"publisher","DOI":"10.1016\/j.ajog.2009.10.864"},{"key":"bibr-OM-11-0091-CPC24","unstructured":"Australian Bureau of Statistics (ABS). Australian Bureau of Statistics 2006 Census MapStats. Australian Capital Territory, Australia: ABS. 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