Fetus-Placenta-NewbornParity and pregnancy outcomes☆,☆☆
Section snippets
Material and methods
The New South Wales Midwives Data Collection (MDC) is a population-based surveillance system that covers all births in New South Wales, Australia. It encompasses all births of at least 20 weeks gestation or at least 400 g birth weight.10, 11 The MDC data was collected with the use of a standardized form for all New South Wales births. The data include demographic details and information of maternal health, pregnancy, labor, delivery, and perinatal outcomes.
During the period of 1992 and 1997,
Results
Of 510,989 study subjects, 40% were nulliparous; the proportion of multiparous women with parity 1 through 6 and 7 to 8 were 33.6%, 16.7%, 6.2%, 2.1%, 0.8%, 0.3%, and 0.2%, respectively (Table I).Table I also compares the sociodemographic characteristics of the study subjects between the different parity groups. The mean maternal age increased linearly with the increasing of parity (P <.001). There was a significant difference between private health insurance status and parity (P <.001); the
Comment
The major finding of this study is that, in this population, subjects with different parity are at different maternal and neonatal risks. Subjects can be classified into 3 groups according to their parity: nulliparity, low multiparity, and grand multiparity, in respect to the differences of the statistics of obstetric complications, neonatal morbidity, and perinatal death. By low multiparity, we mean parity 1, 2, and 3 (the delivery of the second to fourth baby). By grand multiparity, we mean
Acknowledgements
We thank the Epidemiology and Health Services Evaluation Branch, New South Wales Health Department, for providing access to the New South Wales Midwives Data Collection.
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Supported by the Health Research Foundation of Sydney South West.
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Reprint requests: Jun Bai, MPH, Division of Women’s and Child Health, Liverpool Hospital, NSW Australia, Locked Bag 7103, Liverpool BC NSW 1871, Australia. E-mail: [email protected]