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KMID : 0892720150190010095
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Journal of the Korean Society of Maternal and Child Health
2015 Volume.19 No. 1 p.95 ~ p.102
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Incidence of Late Preterm Birth in Primi- and Multiparous Women by Maternal Age; 2008~2012 Singleton Birth Certificate Data of Korea
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Park Sang-Hwa
Song In-Myung
Lim Dar-Oh
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Abstract
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Purpose: The objective of this study was to compare the incidence of late preterm (34~36 weeks: LP) birth in primi- and multiparous women aged 30~34, 35~39, and ≥40 years with primiparous women aged 20~29 years.
Methods: Odds ratio of LP birth by maternal age and 95% confidence intervals (CI) were calculated from logistic regression analyses adjusted for maternal and infantile variables (year of birth, infantile gender, marital status, maternal education and occupation). We used 2008~2012 singleton birth certificate data of Korea Statistics excluding maternal age ≤19 years and early preterm (gestational age ≤33 weeks). The study cases consisted of 2,227,741 births; 122,045 mothers (5.5%) were aged 20~24 years, 713,704 (32.1%) were aged 25~29 years, 1,020,910 (45.9%) were aged 30~34 years and 368,790 (16.5%) were aged ≥35 years.
Results: The incidence of infants born LP was 3.5% during 2008~2012. Compared with primiparous women aged 20~29 years, the odds ratio of LP birth were 1.18 (CI: 1.15~1.21) for multiparous women aged 20~29 years, 1.13 (CI: 1.11~1.16) in primiparas versus 1.14 (CI: 1.11~1.16) in multiparas aged 30~34 years, 1.47 (CI: 1.42~1.52) in primiparas versus 1.38 (CI: 1.34~1.41) in multiparas aged 35~39 years, and 1.89 (1.76~2.03) in primiparas versus 2.06 (1.96~2.16) in multiparas aged 40 years and over.
Conclusion: Advanced maternal age in primi- and multiparous women was associated with LP birth after adjusting for the maternal and infantile variables. There was a need for more research in this area to understand the risk factors for LP birth.
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KEYWORD
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late preterm birth, maternal age, primi and multipara
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