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J Korean Soc Matern Child Health > Volume 21(3); 2017 > Article
Journal of The Korean Society of Maternal and Child Health 2017;21(3):193-198.
DOI: https://doi.org/10.21896/jksmch.2017.21.3.193    Published online September 30, 2017.
Contribution of Maternal Age Distribution to Incidence of Preterm Birth in Multiple Births; from 1997~98 to 2014~15
Sang Hwa Park1, Dar Oh Lim2
1Institute of Reproductive Medicine and Population, Medical Research Center, Seoul National University, Korea
2Department of Health Administration, Kongju National University, Korea
다태아 출산 연령 분포가 다태 조기분만아 출생률에 미치는 기여 효과; 1997~98, 2014~15
박상화1, 임달오2
1서울대학교 의학연구원 인구의학연구소
Correspondence:  Dar Oh Lim,
Email: moon5@kongju.ac.kr
To figure out the contribution of maternal age distribution to the preterm birth (PTB) rate of multiple births between 1997~98 and 2014~15.
Multiple birth certificate data of Korea Statistics were used for this analysis. There were 18,557 births in 1997~98 and 30,992 births in 2014~15. Kitagawa’s decomposition method was used to examine the contribution of age-specific PTB rate and maternal age distribution of multiple births to overall increment of PTB rate in multiple births between 1997~98 and 2014~15.
PTB rate of multiple births increased from 32.40 percent to 58.22 percent (odds ratio: 1.80, 95% confidence interval: 1.76~1.84) during 1997-2015. PTB rate of multiple births greatly increased for women aged 25~29 years (odds ratio: 2.09) during the same period. The rates increased 1.88 times for women aged ≤24 years, followed by women aged 30~34 years (OR: 1.65), women aged 35~39 years (1.54), and women aged ≥40 years (1.36). Most (78.7%) of the overall increment in PTB rate of multiple births was attributable to the increase in the dimension of women aged 30~34 years, and 49.9 percent for women aged 35~39 years.
The total increment in the PTB rate of multiple births was explained by increase the proportion and the PTB rate of women aged 30~39 years. More research is needed to comprehend the contributing age factors to PTB rate of multiple births.
Key Words: multiple births, preterm birth, contribution of preterm

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