TY - JOUR
T1 - Multiple maternities and neighborhood income
AU - Urquia, Marcelo Luis
AU - Frank, John William
AU - Glazier, Richard Henry
AU - Moineddin, Rahim
N1 - Funding Information:
Supported by the Institute for Clinical Evaluative Sciences, Toronto, Ontario, Canada, and the Ontario Ministry of Health and Long-Term Care. The opinions, results, and conclusions are those of the authors and no endorsement by the Ministry is intended or should be inferred.
Funding Information:
ML Urquia was supported by the Institute of Population and Public Health of the Canadian Institutes of Health Research.
Copyright:
Copyright 2008 Elsevier B.V., All rights reserved.
PY - 2007/3/1
Y1 - 2007/3/1
N2 - This study aimed to examine differences in multiple maternities by neighborhood-income levels in Toronto, Canada. Hospital records were used to perform secondary analysis of 144,731 maternities resulting in single or multiple infants live-born to mothers residing in the City of Toronto 1996 to 2001. The independent variable was neighborhood income, defined as mean household neighborhood-income 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.
AB - This study aimed to examine differences in multiple maternities by neighborhood-income levels in Toronto, Canada. Hospital records were used to perform secondary analysis of 144,731 maternities resulting in single or multiple infants live-born to mothers residing in the City of Toronto 1996 to 2001. The independent variable was neighborhood income, defined as mean household neighborhood-income 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.
UR - http://www.scopus.com/inward/record.url?scp=34247540417&partnerID=8YFLogxK
U2 - 10.1375/twin.10.2.400
DO - 10.1375/twin.10.2.400
M3 - Article
C2 - 17564531
AN - SCOPUS:34247540417
VL - 10
SP - 400
EP - 405
JO - Twin Research and Human Genetics
JF - Twin Research and Human Genetics
SN - 1832-4274
IS - 2
ER -