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Open Access Highly Accessed Research article

Very advanced maternal age and morbidity in Victoria, Australia: a population based study

Mary C Carolan1*, Mary-Ann Davey23, Maryanne Biro4 and Michelle Kealy3

Author Affiliations

1 School of Nursing and Midwifery, Victoria University, St Alban’s Campus, PO Box 14228, Melbourne 8001, Australia

2 Consultative Council on Obstetric and Paediatric Mortality and Morbidity, Clinical Councils Unit, Department of Health, 50 Lonsdale Street, Melbourne, Victoria 3000, Australia

3 Mother and Child Health Research, La Trobe University, Melbourne, Australia

4 School of Nursing and Midwifery, Monash University, Clayton Campus, Wellington Road, Clayton 3800, Australia

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BMC Pregnancy and Childbirth 2013, 13:80  doi:10.1186/1471-2393-13-80

Published: 27 March 2013

Abstract

Background

In Australia, approximately 0.1% of births occur to women 45 years or older and this rate has been increasing in recent years. There are however, few population based studies examining perinatal outcomes among this age group. The aim of this study was to determine the maternal and perinatal outcomes of pregnancies in women aged 45 years or older compared to women aged 30–34 years.

Methods

Data on births at 20 or more weeks’ gestation were obtained from the Victorian Perinatal Data Collection for the years 2005 and 2006. We examined selected maternal and perinatal outcomes for women of very advanced maternal age (VAMA) aged 45 years or older (n = 217) and compared them to women aged 30–34 years (n = 48,909). Data were summarised using numbers and percentages. Categorical data were analysed by Chi-square tests and Fisher’s exact test. Comparisons are presented using unadjusted odds ratios, 95 percent confidence intervals (CIs) and p-values.

Results

Women aged 45 years and older had higher odds of gestational diabetes (OR 2.05; 95% CI 1.3–3.3); antepartum haemorrhage (OR 1.89; 95% CI 1.01–3.5), and placenta praevia (OR 4.88; 95% CI 2.4–9.5). The older age-group also had higher odds of preterm birth between 32–36 weeks (OR 2.61; 95% CI 1.8–3.8); low birth-weight (<2,500 gr) (OR 2.22; 95% CI 1.5–3.3) and small for gestational age (OR 1.53; 95% CI 1.0–2.3). Stratified analysis revealed that VAMA was most strongly associated with caesarean section in primiparous women (OR 8.24; 95% CI 4.5, 15.4) and those using ART (OR 5.75; 95% CI 2.5, 13.3), but the relationship persisted regardless of parity, ART use and plurality. Low birthweight was associated with VAMA only in first births (OR 3.90; 95% CI 2.3, 6.6), while preterm birth was more common in older women for both first (OR 3.13; 95% CI 1.8, 5.3) and subsequent (OR 2.08; 95% CI 1.2, 3.5) births, and for those having singleton births (OR 2.11; 95% CI 1.3, 3.4), and those who did not use ART (OR 2.10; 95% CI 1.3, 3.4). Preterm birth was very common in multiple births and following ART use, regardless of maternal age.

Conclusions

This study demonstrates that women aged 45 years and older, in Victoria, Australia, have higher rates of pregnancy and perinatal complications, compared to women aged 30–34 years.

Keywords:
Perinatal death; Very advanced maternal age; Low birth weight; Preterm birth; Haemorrhage