Change trend of birth weight of twins in China, 1995-2012.

Qingqing Liu; Canqing YU; Wenjing Gao; Weihua Cao; Jun Lyu; Shengfeng Wang; Zengchang Pang; Liming Cong; Zhong Dong; Fan WU; Hua Wang; Xianping WU; Dezheng Wang; Binyou Wang; Liming LI

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Change trend of birth weight of twins in China, 1995-2012.

Author: Qingqing LIU ¹ ; Canqing YU ² ; Wenjing GAO ¹ ; Weihua CAO ¹ ; Jun LYU ¹ ; Shengfeng WANG ¹ ; Zengchang PANG ³ ; Liming CONG ⁴ ; Zhong DONG ⁵ ; Fan WU ⁶ ; Hua WANG ⁷ ; Xianping WU ⁸ ; Dezheng WANG ⁹ ; Binyou WANG ¹⁰ ; Liming LI ¹¹
Author Information

1. Department of Epidemiology and Biostatistics, School of Public Health, Peking University, Beijing 100191, China.
2. Department of Epidemiology and Biostatistics, School of Public Health, Peking University, Beijing 100191, China. Email: canqing.yu@gmail.com.
3. Qingdao Center for Disease Control and Prevention.
4. Zhejiang Provincial Center for Disease Control and Prevention.
5. Beijing Center for Disease Control and Prevention.
6. Shanghai Center for Disease Control and Prevention.
7. Jiangsu Provincial Center for Disease Control and Prevention.
8. Sichuan Provincial Center for Disease Control and Prevention.
9. Tianjin Center for Disease Control and Prevention.
10. School of Public Health, Harbin Medical University.
11. Department of Epidemiology and Biostatistics, School of Public Health, Peking University, Beijing 100191, China. Email: lmlee@vip.163.com.
Publication Type:Journal Article
MeSH: Birth Rate; Birth Weight; China; epidemiology; Humans; Infant, Newborn; Registries; Retrospective Studies; Twins
From: Chinese Journal of Epidemiology 2015;36(2):115-118
CountryChina
Language:Chinese
Abstract:
OBJECTIVETo understand the change trend of birth weight of twins in China from 1995 to 2012.
METHODSA total of 10 827 twins born between 1995 and 2012 registered in national twin registry system in 8 provinces in China were included in this study. A retrospective study was conducted to analyze the change trend of twin's birth weight.
RESULTSMean birth weight of twins decreased by 0.01 kg every five years after adjusting sex, ovum type and place of birth (P = 0.041). The birth weight decreased both in superior twin and in inferior twin over time. After 2007, the birth weight of superior twin decreased by 0.008 kg each year, while the birth weight of inferior twin decreased by 0.014 kg each year. Mean relative difference in birth weight and birth weight discordant rate decreased before 2002, then increased from the lowest point 8.16% and 16.20% to highest point 9.99% and 22.40% respectively.
CONCLUSIONThe birth weight of twins in China decreased between 1995 and 2012, while the birth weight discordant rate increased, suggesting that close attention should be paid to the discordance of twin body weight to reduce the risk of adverse health outcome.