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KMID : 1155220210460030362
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Journal of the Korean Society of Health Information and Health Statistics
2021 Volume.46 No. 3 p.362 ~ p.368
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Secular Trend of Twin Birth Rate in Metropolitan Cities of Korea, 2000-2019
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Park Sang-Hwa
Kwon Kyoung-Hun
Lee Shi-Nae
Kim Su-Beom
Seo Min-Jeong
Yang Won-Chang
Lim Dar-Oh
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Abstract
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Objectives: To analyze the seven metropolitan cities of twin birth rate per 100 births (TBR) from 2000 to 2019 in Korea.
Methods: We used the 2000- 2019 birth certificated data (3,949,097 births) of seven metropolitan cities from Statistics Korea. The data of extra-marital birth and information missing cases (maternal and paternal age and triplet birth) were excluded. The odds ratio and 95% confidence intervals were calculated using logistic regression to describe the regional variance of TBR adjusted for maternal age, age difference between couple and maternal educational backgrounds.
Results: During this period (2000-2019 years), the highest TBR by region was observed in Ulsan and Seoul metropolitan city (3.0), and the lowest TBR in Deagu metropolitan city (2.6). The TBR increased by 275 percent from 1.74 in 2000 to 4.79 in 2019. During the period from 2000-2004 to 2015-2019, there was the highest increment of TBR in Ulsan metropolitan city (odds ratio: 1.78; 95% confidence interval: 1.64-1.92) and Busan metropolitan city (1.74; 1.65-1.83), and the lowest increment in Daegu metropolitan city (1.24; 1.17-1.31), after adjustment by logistic regression for demographic variables. During the period 2015-2019 years, there was a significant increase the odds ratio of TBR in Ulsan metropolitan city (1.39), Busan metropolitan city (1.33), Seoul metropolitan city (1.25) and Incheon metropolitan city (1.23), as compared with the TBR of Deagu metropolitan city.
Conclusions: Over the past two decades, TBR have risen dramatically in metropolitan cities of Korea. Regional variance of TBR was observed among metropolitan cities in Korea. There is a need for more research to understand the socio-demographic and medical factors associated with regional differences. The national birth registration system needs to be reformed to monitor whether twin births are spontaneous or assisted pregnancy.
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KEYWORD
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Twin birth rate, Regional difference, Secular trend of twin birth
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