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Advanced Maternal Age and the Risk of Low Birth Weight and Preterm Delivery: a Within-Family Analysis Using Finnish Population Registers
Stockholm University, Faculty of Social Sciences, Department of Sociology. London School of Economics and Political Science, United Kingdom; Max Planck Institute for Demographic Research, Germany.
Stockholm University, Faculty of Social Sciences, Centre for Health Equity Studies (CHESS).ORCID iD: 0000-0001-9374-1438
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Number of Authors: 52017 (English)In: American Journal of Epidemiology, ISSN 0002-9262, E-ISSN 1476-6256, Vol. 186, no 11, p. 1219-1226Article in journal (Refereed) Published
Abstract [en]

Advanced maternal age at birth is considered a major risk factor for birth outcomes. It is unclear to what extent this association is confounded by maternal characteristics. To test whether advanced maternal age at birth independently increases the risk of low birth weight (< 2,500 g) and preterm birth (< 37 weeks' gestation), we compared between-family models (children born to different mothers at different ages) with within-family models (children born to the same mother at different ages). The latter procedure reduces confounding by unobserved parental characteristics that are shared by siblings. We used Finnish population registers, including 124,098 children born during 1987-2000. When compared with maternal ages 25-29 years in between-family models, maternal ages of 35-39 years and a parts per thousand<yen>40 years were associated with percentage increases of 1.1 points (95% confidence intervals: 0.8, 1.4) and 2.2 points (95% confidence intervals: 1.4, 2.9), respectively, in the probability of low birth weight. The associations are similar for the risk of preterm delivery. In within-family models, the relationship between advanced maternal age and low birth weight or preterm birth is statistically and substantively negligible. In Finland, advanced maternal age is not independently associated with the risk of low birth weight or preterm delivery among mothers who have had at least 2 live births.

Place, publisher, year, edition, pages
2017. Vol. 186, no 11, p. 1219-1226
Keywords [en]
low birth weight, maternal age, preterm delivery
National Category
Public Health, Global Health, Social Medicine and Epidemiology Sociology
Identifiers
URN: urn:nbn:se:su:diva-151160DOI: 10.1093/aje/kwx177ISI: 000417301500001PubMedID: 29206985OAI: oai:DiVA.org:su-151160DiVA, id: diva2:1174025
Available from: 2018-01-15 Created: 2018-01-15 Last updated: 2018-01-15Bibliographically approved

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