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No improvement in socioeconomic inequalities in birthweight and preterm birth over four decades: a population-based cohort study

Lookup NU author(s): Dr Svetlana Glinianaia, Dr Rakesh Ghosh, Professor Judith Rankin, Professor Mark PearceORCiD, Professor Louise Parker, Professor Tanja Pless-Mulloli



Background: Birthweight and gestational age are associated with socioeconomic deprivation, but the evidence in relation to temporal changes in these associations is sparse. We investigated changes in the associations between socioeconomic status (SES) and birthweight and gestational age in Newcastle upon Tyne, North of England, during 1961-2000. Methods: We used population-based data from hospital neonatal records on all singleton births to mothers resident in Newcastle (births with complete covariate information n = 113,182). We used linear regression to analyse the associations between neighbourhood SES and birthweight over the entire 40-year period and by decade, and logistic regression for associations with low birthweight (LBW) and preterm birth, adjusting for potential confounders. Results: There was a significant interaction between SES and decade of birth for birthweight (p = 0.028) and preterm birth (p < 0.001). Socioeconomic gradients were similar in each decade for birthweight outcomes, but for preterm birth, socioeconomic disparities were more evident in the later decades [for 1961-70, odds ratio (OR) was 1.1, 95% CI 0.9, 1.3, for the most deprived versus the least deprived quartile, while for 1991-2000, the corresponding OR was 1.5, 95% CI 1.3, 1.7]. In each decade, there was a significant decrease in birthweight adjusted for gestational age for the most deprived compared to the least deprived SES group [1961-1970:-113.4g (95% CI-133.0, -93.8); 1991-2000:-97.5g (95% CI-113.0, -82.0)], while there was a significant increase in birthweight in each SES group over time. Conclusions: Socioeconomic inequalities did not narrow over the four decades for birthweight and widened for preterm birth. Mean birthweight adjusted for gestational age increased in all socioeconomic groups, suggesting an overall increase in fetal growth.

Publication metadata

Author(s): Glinianaia SV, Ghosh R, Rankin J, Pearce MS, Parker L, Pless-Mulloli T

Publication type: Article

Publication status: Published

Journal: BMC Public Health

Year: 2013

Volume: 13

Print publication date: 15/04/2013

Date deposited: 12/07/2013

ISSN (electronic): 1471-2458

Publisher: BioMed Central Ltd


DOI: 10.1186/1471-2458-13-345

Notes: Article no. 345 is 18 pp.


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Funder referenceFunder name
Career Scientist Award from the National Institute of Health Research (UK Department of Health)
072465/Z/03/ZWellcome Trust