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Cited by 400Maternal and Perinatal Health InterventionsMaternal and Neonatal HealthcareAssisted Reproductive Technology and Twin Pregnancy

The Perinatal Effects of Delayed Childbearing

Joseph, K S., Allen, Alexander C., Dodds, Linda, Turner, Linda Ann, Scott, Heather, Liston, Robert·2005·Obstetrics & Gynecology
DOI 10.1097/01.aog.0000163256.83313.36
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Abstract

OBJECTIVE: To determine if the rates of pregnancy complications, preterm birth, small for gestational age, perinatal mortality, and serious neonatal morbidity are higher among mothers aged 35-39 years or 40 years or older, compared with mothers 20-24 years. METHODS: We performed a population-based study of all women in Nova Scotia, Canada, who delivered a singleton fetus between 1988 and 2002 (N = 157,445). Family income of women who delivered between 1988 and 1995 was obtained through a confidential linkage with tax records (n = 76,300). The primary outcome was perinatal death (excluding congenital anomalies) or serious neonatal morbidity. Analysis was based on logistic models. RESULTS: Older women were more likely to be married, affluent, weigh 70 kg or more, attend prenatal classes, and have a bad obstetric history but less likely to be nulliparous and to smoke. They were more likely to have hypertension, diabetes mellitus, placental abruption, or placenta previa. Preterm birth and small-for-gestational age rates were also higher; compared with women aged 20-24 years, adjusted rate ratios for preterm birth among women aged 35-39 years and 40 years or older were 1.61 (95% confidence interval [CI] 1.42-1.82; P < .001) and 1.80 (95% CI 1.37-2.36; P < .001), respectively. Adjusted rate ratios for perinatal mortality/morbidity were 1.46 (95% CI 1.11-1.92; P = .007) among women 35-39 years and 1.95 (95% CI 1.13-3.35; P = .02) among women 40 years or older. Perinatal mortality rates were low at all ages, especially in recent years. CONCLUSION: Older maternal age is associated with relatively higher risks of perinatal mortality/morbidity, although the absolute rate of such outcomes is low.

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  • There is a scarcity of comprehensive data on the relationship between advancing maternal age and maternal mortality rates.

    “Despite this, there remains a scarcity of comprehensive data on the relationship between advancing maternal age and maternal mortality rates [9].”

    From Age-related disparities in national maternal mortality trends: A population-based study (2025) · cites this paper as [9]

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Authors
Joseph, K. S., Allen, A. C., Dodds, L., Turner, L. A., Scott, H., & Liston, R.
Affiliations
  • Dalhousie University (CA)
  • Western University (CA)
  • University of British Columbia (CA)
ORCID
Venue
Obstetrics & Gynecology
Publisher
Ovid Technologies (Wolters Kluwer Health)
Published
2005-06
Volume
105
Issue
6
Pages
1410-1418
ISSN
0029-7844 (ISSN-L)
DOI
10.1097/01.aog.0000163256.83313.36
OpenAlex
W1982603272
Cited by
400
References
31
Citations by year
2026: 5 · 2025: 13 · 2024: 7 · 2023: 10 · 2022: 10 · 2021: 26 · 2020: 19 · 2019: 20 · 2018: 18 · 2017: 23 · 2016: 15 · 2015: 19 · 2014: 21 · 2013: 44 · 2012: 36
FWCI
18.85
Type
journal article
Language
en
Open access
closed
Locations
  • Obstetrics and Gynecology (publishedVersion)
  • PubMed (publishedVersion)
Topics
  • Health Sciences › Medicine › Obstetrics and Gynecology › Maternal and Perinatal Health Interventions
  • Health Sciences › Health Professions › General Health Professions › Maternal and Neonatal Healthcare
  • Health Sciences › Medicine › Pediatrics, Perinatology and Child Health › Assisted Reproductive Technology and Twin Pregnancy
Keywords
advanced maternal age, delayed childbearing, perinatal mortality, preterm birth, small for gestational age, pregnancy complications, neonatal morbidity, maternal age, placental abruption, placenta previa, hypertension in pregnancy, diabetes in pregnancy, Nova Scotia
MeSH terms
Adult, Family Planning Services, Female, Humans, Income, Infant Mortality, Infant, Newborn, Obstetric Labor, Premature, Maternal Age, Nova Scotia, Parity, Pregnancy, Pregnancy Complications, Pregnancy Outcome, Prenatal Care, Smoking, Logistic Models

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