Epidemiology of Twin Births in Southeast China: 1993–2005

Xi, Lü; Zhang, Jun; Liu, Yinghui; Wang, Ting; Lü, Yanyu; Zhu, Li

doi:10.1017/thg.2013.7

Cited by 16 publications

(12 citation statements)

References 27 publications

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“…We found that the overall twinning rate of 18.8‰ was similar to previous rates observed in China (from 13 to 20.5 per 1000 births) [22–24] and other Asian countries (i.e. 19.3‰ in 2002 in Korea [25] and 19.5‰ in 2009 in Japan [26]) but lower than those in some western countries (i.e., 27.3‰ in England and Wales, 28.3‰ in France in 1997 [6], and 33.3‰ in 2009 in the United States [1]).…”

Section: Discussionsupporting

confidence: 86%

Temporal trends in the birth rates and perinatal mortality of twins: A population-based study in China

et al. 2019

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ObjectiveUntil now, little was known about the epidemiological characteristics of twins in China due to a lack of reliable national data. In this study, we aimed to analyze temporal trends and perinatal mortality of twins from China.MethodsData on twins between 2007 and 2014 were obtained from the China National Population-Based Birth Defects Surveillance System. Twin and singleton deliveries after at least 28 weeks of gestation were recruited and followed until postnatal day 42. Twinning rates were defined as the number of twin individuals per 1000 births(stillbirths and live births). The Weinberg’s differential method was utilized to estimate the number of monozygotic and dizygotic twins.ResultsDuring 2007–2014, the twinning rate increased by 32.3% from 16.4 to 21.7 per 1000 total births with an average of 18.8‰. Among twins, both the perinatal mortality rate (26.1 per 1000 total births) and neonatal death rate (15.7 per 1000 live births) presented a downward tendency but remained at a high level. Large urban-rural and geographic disparities were identified in twinning rates, in perinatal and neonatal mortality, and in their temporal trends.ConclusionsThe upward trend of twinning rates in China paired with the relatively high rates of perinatal and neonatal mortality among twins highlights the need for improved perinatal care in the light of socio-demographic differences.

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Section: Discussionsupporting

confidence: 86%

Temporal trends in the birth rates and perinatal mortality of twins: A population-based study in China

et al. 2019

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“…Data collection and all methods used in the surveillance program were approved by the institutional review board of Peking University Health Science Center. Oral informed consent was obtained from every woman as per the PHCSS protocol [ 28 , 29 ]. Women residing in regions covered by the PHCSS registered at their marital physical examination or first prenatal visit.…”

Section: Methodsmentioning

confidence: 99%

Secular trends in age at menarche among women born between 1955 and 1985 in Southeastern China

et al. 2014

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BackgroundImprovements in socioeconomic conditions and population health have been linked to declining age at menarche. In China, secular trends in age at menarche following extensive economic reform during recent decades have not been thoroughly investigated. This study examined the overall trend in age at menarche and assessed differences in the rate of change of age at menarche over time, and between urban and rural populations and education levels in southeastern China.MethodsAge at menarche was retrospectively collected from 1,167,119 Han Chinese women born 1955–1985, who registered in the Perinatal Health Care Surveillance System in 19 cities and counties in two southeast provinces during 1993–2005. Multivariable linear regression was used to estimate trends in age at menarche overall and stratified by urban/rural residence and education level.ResultsAge at menarche declined by 0.33 [95% CI 0.33, 0.32] years/decade overall, with the fastest decline in women born in 1966–1975. For the earliest birth cohorts (1955–1965), age at menarche declined faster in urban versus rural regions, and for women with high school education or above versus primary school or less. In contrast, age at menarche declined slower among urban women born 1976–1985, and among those with higher education born 1966–1985.ConclusionsMean age at menarche declined for women born in 1955–1985 in southeast China. Further study is warranted to identify specific factors contributing to earlier age at menarche and associated health outcomes.Electronic supplementary materialThe online version of this article (doi:10.1186/s12905-014-0155-0) contains supplementary material, which is available to authorized users.

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“…The incidence of multiple birth in China is rising [ 15 ], but no recent studies have examined pregnancy complications in women with multiple pregnancy using a multi-center database. The two-child policy was established in China in 2016, so a baby-boom period is expected in the next decade and, with it, an increase in multiple gestation pregnancies.…”

Section: Introductionmentioning

confidence: 99%

Complications in multiple gestation pregnancy: A cross-sectional study of ten maternal-fetal medicine centers in China

Wei

Zhang

et al. 2016

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Complications in women with multiple gestation pregnancy have not been studied in China. We aimed to establish a database of women with multiple gestation pregnancy and investigate the complications related to multiple pregnancy. We conducted a cross-sectional study that included 3246 women with multiple gestation pregnancy and who had multiple live-birth deliveries; the women were registered at ten maternal-fetal medicine centers in China in 2013. All participants completed a detailed questionnaire that included basic demographic information, history of gestation and abnormal fetal development, risk factors during pregnancy, and pregnancy outcomes. Overall, 1553 (47.8%) women experienced pregnancy complications; these women were more likely to have lower height and less education than women who did not experience complications. However, women who experienced complications had a higher twin birth rate and were more likely to have received regular antenatal care and assisted reproductive technology than women without complications (P < 0.05). Notably, preterm birth was a primary complication in multiple pregnancy (n = 960). In conclusion, pregnancy complications, especially preterm birth, were relatively common in women with multiple gestation pregnancy. The findings from this cross-sectional study in China may be used as a foundation for investigating risk factors for complications in women with multiple gestation pregnancy in the future.

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Epidemiology of Twin Births in Southeast China: 1993–2005

Cited by 16 publications

References 27 publications

Temporal trends in the birth rates and perinatal mortality of twins: A population-based study in China

Temporal trends in the birth rates and perinatal mortality of twins: A population-based study in China

Secular trends in age at menarche among women born between 1955 and 1985 in Southeastern China

Complications in multiple gestation pregnancy: A cross-sectional study of ten maternal-fetal medicine centers in China

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