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KMID : 1155220150400020022
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Journal of the Korean Society of Health Information and Health Statistics
2015 Volume.40 No. 2 p.22 ~ p.30
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Preterm Birth and Intra Twin Birth Weight Discordance in Korea; 2009-2013
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Park Sang-Hwa
Han Jung-Ho
Lim Dar-Oh
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Abstract
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Objectives: To compare the relationship between intra-twin birth weight discordance and preterm birth (PTB; ≤36 weeks) by analyzing the birth certificated data of Koera Statistics.
Methods: The 2009-2013 birth certificated data of Korea Statistics was used for this analysis. There were 31,998 completely matched twin pairs from 67,557 twin birth data. The data of unmatched twin cases, teenage birth, extra-marital birth, non-hospital birth cases, and gestational age and birth weight information missing cases were excluded. Odds ratio and 95 percent confidence intervals were calculated from logistic regression analyses to describe the risk of PTB by the degree of intra twin birth weight discordance (birth weight difference/ birth weight of heavier twin x 100) adjusted for infantile sex, birth order, maternal age, year of birth, and maternal education & occupation.
Results: The incidence of intra-twin birth weight discordance was 55.3 percent in discordance level of ≤9 percent, and 4.4 percent in discordance level of ≥30 percent. The mean gestational age was getting shorter from 35.9 weeks in discordance level of ≤9 percent to 34.8 weeks in discordance level of ≥30 percent. The rate of PTB in twins was increased with increasing degree of birth weight discordance. The PTB rates were 52.1 percent and 70.8 percent, respectively, in subjects with a birth weight discordance of ≤9 percent and in those ≥30 percent. Compared with birth weight discordance of ≤9 percent, odds ratio of PTB was 1.15 (95% confidence interval: 1.07-1.24) in birth weight discordance (20%), and 2.28 (2.02-2.57) in birth weight discordance of ≥30 percent.
Conclusions: The risk of PTB was significantly increased with higher degree of intra-twin birth weight discordance of ≥20 percent.
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KEYWORD
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Twin birth, Birth weight discordance, Preterm birth
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