The Discordance of Intra-twin Birth Weight by Infantile Gender and Birth Order in Korea; 2008-2013

Park, Sanghwa; Shin, Jae Jun; Kim, Hoon; Lim, Dar Oh

doi:10.14734/kjp.2015.26.3.229

Cited by 2 publications

(1 citation statement)

References 23 publications

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“…쌍태아 출생률의 증가와 함께 최근 2010-2013년 사이에 출생체중 불일치 수준의 증가와 관련한 보고 [18]는 출생체중 불일치와 관련된 불리한 예후에 노출되는 규모도 과거보다 더 클 것으로 보인다. 우리나 라의 쌍태아 출생체중 불일치 연구는 과거에 의료기관 중심으로 소규 모 집단을 통해 쌍태아의 출생체중 차이와 주산기 예후에 관한 연구 [19,20], 쌍태아의 임신 주수별 체중 분포 [21]와 같은 연구가 이루어져 왔으며, 최근에 출생통계를 이용한 출생체중 불일치 수준과 조기분만 발생 위험도 [18], 성별, 출생순위별 불일치 발생 수준에 대한 연구가 보 고된 바 있다 [22]. 그러나…”

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Gestational Age and Inter Twin Birth Weight Discordance in Korea; 2007-2014

Park¹,

Jo²,

Lim³

2016

J Health Info Stat

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Objectives:To compare the relationship between gestational age and inter twin birth weight discordance level. Methods: We used the 2007-2014 birth certificated data of Statistics Korea 51,783 pairs of twins. The data of unmatched twin cases, extra-marital birth and non-hospital birth cases were excluded. Birth weight discordance rate was calculated as (birth weight difference between larger and smaller birth weight/birth weight of heavier twin) x 100. Odds ratio and 95% confidence intervals were calculated from logistic regression analyses to describe the birth weight discordance ( ≥ 25%) of gestational age adjusted by year of birth, infantile gender, maternal age, maternal education, and age difference between couples. Results: The incidence of inter twin birth weight discordance was 55.3 percent in discordance of ≤ 9 percent, 10.9 percent in discordance of 20-29 percent, and 4.4 percent in discordance of ≥ 30 percent. The frequency of more than 25 percent discordant set demonstrated polynomial relationship to gestational age (Y = -82.294+6.226X-0.101X 2 , R 2 = 0.77, p < 0.01). Overall incidence of birth weight discordance more than 25 percent was 8.3 percent. The frequency of discordance level ( ≥ 25%) by gestational age was 10.7 percent in extremely preterm ( ≤ 27 weeks), 14.3 percent in very preterm (28-31 weeks), 13.1 percent in moderate preterm (32-33 weeks), 8.7 percent in late preterm (34-36 weeks), and 5.8 percent in full and late term ( ≥ 39 weeks). The rate of discordance level of ≥ 25 percent decreased with increasing gestational age. Compared with discordance level ( ≥ 25%) of full and late term, odds ratio of discordance level ( ≥ 25%) was 2.76 (95% confidence interval; 2.05-3.70) in very preterm, 2.48 (1.86-3.31) in moderate preterm, 1.97 (1.37-2.83) in extremely preterm, and 1.56 (1.19-2.05) in late preterm. Conclusions: The risk of discordance level of ≥ 25 percent increased significantly with very preterm and moderate preterm birth. There is a need to understand the contributing factors and close attention to reduce the risk of discordance level of ≥ 25 percent in gestational age from 28 to 33 weeks.

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Gestational Age and Inter Twin Birth Weight Discordance in Korea; 2007-2014

Park¹,

Jo²,

Lim³

2016

J Health Info Stat

Self Cite

View full text Add to dashboard Cite

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Distribution and Definition of Degree for Inter Twin Birth Weight Discordance

Park¹,

Lim²

2019

J Health Info Stat

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Objectives: To compare the frequency of inter twin birth weight discordance, and degree of discordance rate in twin births by gestational age. Methods: There were 51,783 pairs of twins from 2007-2014 of birth certificated data of Korea Statistics. We excluded extramarital and non-hospital birth cases. Birth weight discordance rate (%) was calculated as (birth weight of larger twin-birth weight of smaller twin)/birth weight of larger twin and multiplied with 100. Birth weight discordance values was calculated to describe the degree of discordance by 50th, 90th, and 95th percentile, and two standard deviations above the mean, and frequency of severe birth weight discordancy (birth weight discordancy equal to or more than 25%) at each gestational age. Results: The mean discordance rate for inter twin was 11.0% ± 9.3%. The discordance values was not a normal (Gaussian) distribution (Kolmogorov-Smirnov test: p-value = 0.01), and the best-fit function was exponential model (R 2 = 0.94, p < 0.01). The cumulative frequency of discordance values had cubic model (R 2 = 0.99, p < 0.01). The 50th percentile of birth weight discordancy was 8.8% discordance, the 90th was 23.4%, and the 95th was 29.1%. At earlier gestational age, the percentage discordant according to the 95th percentile of birth weight discordance was higher (37.0% at 28-33 weeks) than at older gestational age (approximately 26.0% at ≥ 37 weeks). The values of 95th percentile represented approximately the severe birth weight discordancy (≥ 25%) in gestational age at 37 weeks and older. Conclusions: The 95th percentile corresponded to a birth weight discordancy of approximately 25 percent at older gestational age (≥ 37 weeks). The degree of twin births weight discordance should be categorized with respect to gestational age since the degree of discordance may vary in different gestational age.

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The Discordance of Intra-twin Birth Weight by Infantile Gender and Birth Order in Korea; 2008-2013

Cited by 2 publications

References 23 publications

Gestational Age and Inter Twin Birth Weight Discordance in Korea; 2007-2014

Gestational Age and Inter Twin Birth Weight Discordance in Korea; 2007-2014

Distribution and Definition of Degree for Inter Twin Birth Weight Discordance

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