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Open Access Research article

Magnitude of income-related disparities in adverse perinatal outcomes

Ketan Shankardass12*, Patricia O’Campo2, Linda Dodds3, John Fahey4, KS Joseph5, Julia Morinis26 and Victoria M Allen3

Author Affiliations

1 Department of Psychology, Wilfrid Laurier University, 75 University Avenue West, Waterloo, Ontario, Canada

2 Centre for Research on Inner City Health, St. Michael’s Hospital and Dalla Lana School of Public Health, University of Toronto, Toronto, Ontario, Canada

3 Department of Obstetrics and Gynaecology, Dalhousie University, Halifax, Nova Scotia, Canada

4 Reproductive Care Program of Nova Scotia, Halifax, Nova Scotia, Canada

5 Department of Obstetrics & Gynaecology, School of Population and Public Health, University of British Columbia and the Children’s and Women’s Hospital of British Columbia, Vancouver, British Columbia, Canada

6 Department of Paediatric Medicine, Hospital for Sick Children, Toronto, Ontario, Canada

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BMC Pregnancy and Childbirth 2014, 14:96  doi:10.1186/1471-2393-14-96

Published: 4 March 2014

Abstract

Background

To assess and compare multiple measurements of socioeconomic position (SEP) in order to determine the relationship with adverse perinatal outcomes across various contexts.

Methods

A birth registry, the Nova Scotia Atlee Perinatal Database, was confidentially linked to income tax and related information for the year in which delivery occurred. Multiple logistic regression was used to examine odds ratios between multiple indicators of SEP and multiple adverse perinatal outcomes in 117734 singleton births between 1988 and 2003. Models for after tax family income were also adjusted for neighborhood deprivation to gauge the relative magnitude of effects related to SEP at both levels. Effects of SEP were stratified by single- versus multiple-parent family composition, and by urban versus rural location of residence.

Results

The risk of small for gestational age and spontaneous preterm birth was higher across all the indicators of lower SEP, while risk for large for gestational age was lower across indicators of lower SEP. Higher risk of postneonatal death was demonstrated for several measures of lower SEP. Higher material deprivation in the neighborhood of residence was associated with increased risk for perinatal death, small for gestational age birth, and iatrogenic and spontaneous preterm birth. Family composition and urbanicity were shown to modify the association between income and some perinatal outcomes.

Conclusions

This study highlights the importance of understanding the definitions of SEP and the mechanisms that lead to the association between income and poor perinatal outcomes, and broadening the types of SEP measures used in some cases.

Keywords:
Perinatal; Socioeconomic position; Health inequalities; Neighborhood; Income