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Journal of The Korean Society of Maternal and Child Health 2004;8(1):7-15.
Published online January 31, 2004.
Effect of Delayed First Childbearing on Low Birth Weight and Pre-term Birth
박정한, 박순우, 이주영, 박성준
대구가톨릭대학교
늦은 첫 임신이 저출생체중 및 조산에 미치는 영향
박정한, 박순우, 이주영, 박성준
대구가톨릭대학교
Abstract
Objectives
: This study was conducted to examine the effect of delayed childbearing on pregnancy outcome among nulliparous women.
Methods
: Study subjects were nulliparous women(N=2,957) of 20 years old or over, who had delivered single birth at one of the hospitals in Pohang city and Chonan city from March 1 to August 31, 2000. Outcome measures were rates of very low birth weight(<1,500gm), low birth weight(<2,500gm), very preterm delivery(<33 weeks), and preterm delivery(<37 weeks). Odds ratios were calculated adjusted for demographic characteristics and medical conditions.
Results
: Women aged 30 years old or over were significantly more likely to have cesarean section, chronic medical conditions, specific antepartum, and intrapartum complications. Compared with women aged 20 to 29 years, women aged 30 to 34 years had significantly higher adjusted odds ratios(ORs) of very preterm birth(OR=2.3, 95% confidence interval 1.3∼4.3), preterm birth(OR=1.6, 95% confidence interval 1.1∼2.3). Among women aged 35 years old and older, the adjusted OR was significantly higher for very preterm birth(OR=5.2, 95% confidence interval 2.1∼12.7), preterm birth(OR=1.9, 95% confidence interval 1.0∼3.9). However, there was no evidence that women between 30~34 years old or those of 35 years old and older have an increased risk of having a low birth weight and very low birth weight infant.
Conclusions
: These findings suggest that delayed childbearing increases the risk of very preterm and preterm delivery, while it does not increase the risk of having a very low birth weight or low birth weight infant.
Key Words: delayed child bearing, low birth weight, pre-term birth


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