| Contribution of Maternal Age Distribution to Incidence of Preterm Birth in Multiple Births; from 1997~98 to 2014~15 |
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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 |
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박상화1, 임달오2 |
1서울대학교 의학연구원 인구의학연구소
2공주대학교 |
Correspondence:
Dar Oh Lim,
Email: moon5@kongju.ac.kr
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| Abstract |
Purpose
To figure out the contribution of maternal age distribution to the preterm birth (PTB) rate of multiple births between 1997~98 and 2014~15.
Methods
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.
Results
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.
Conclusion
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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