Baghurst, Peter, Robson, Stephen, Antoniou, Georgia, Scheil, Wendy, and Bryce, Robert (2014) The association between increasing maternal age at first birth and decreased rates of spontaneous vaginal birth in South Australia from 1991 to 2009. Australian and New Zealand Journal of Obstetrics and Gynaecology, 54 (3). pp. 237-243.

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Abstract

Background: Caesarean section rates in Australia rose over the period 1999–2009, as did maternal age at first birth. The contribution of the rise of maternal age to the rise in caesarean sections remains unclear.

Aims: To estimate the effect of increasing maternal age on the incidence of emergency caesarean section or instrumental delivery in term singleton first births in South Australia.

Methods: We undertook a population‐based study of 117 981 term singleton first births, which followed labour during the period 1991–2009, using data from the South Australian Perinatal Statistics Collection. The main outcome measures were deliveries other than spontaneous vaginal births (SVB) (emergency caesarean section or instrumental birth) and emergency caesarean section alone. Logistic regression analysis was performed.

Results: Increasing maternal age at first birth was found to be associated with delivery other than SVB and emergency caesarean section. The adjusted odds of delivery other than SVB increased multiplicatively by approximately 1.49 (95% CI, 1.47–1.51) per five‐year rise in maternal age, and the odds of emergency caesarean section increased multiplicatively by approximately 1.39 (95% CI, 1.37–1.42) per five‐year rise. Although there are likely to be many reasons for the effect, increases in maternal age at first birth made a contribution in up to 75% of the observed increase in delivery other than SVB from 44.0% to 49.6% over the study period.

Conclusions: Rising maternal age at first birth appeared to contribute to a large proportion of the increase in deliveries other than SVB in South Australia.

Item ID:	65226
Item Type:	Article (Research - C1)
ISSN:	1479-828X
Keywords:	caesarean section, labour, logistic regression, maternal age, population
Copyright Information:	© 2014 The Royal Australian and New Zealand College of Obstetricians and Gynaecologists.
Date Deposited:	01 Dec 2020 04:45
FoR Codes:	11 MEDICAL AND HEALTH SCIENCES > 1114 Paediatrics and Reproductive Medicine > 111402 Obstetrics and Gynaecology @ 100%
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