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• W67984190 abstract "OBJECTIVE: To describe the secular trends and epidemiological characteristics of preterm birth among singletons in 10 counties (cities) of China during 1993-2005. METHODS: We analyzed data on 542 923 women (gestational age > or =28 weeks) collected through Perinatal Healthcare Surveillance System established by the Institute of Reproductive and Child Health Peking University. Chi-square tests were employed to test the differences in prevalence of preterm birth among different groups. RESULTS: 25 784 preterm births were identified including 1530 stillbirths. Preterm birth rate was 4.75% (95% CI:4.69-4.81) for all births and 4.49% (95% CI:4.44-4.55) for live births. Preterm birth rate declined steadily from 1993 to 2005 and had no significant seasonal variation. Preterm birth rate from the urban areas of the Southern part of the countrywas higher than that in the rural areas which was also higher than that seen in the rural areas from the northern part of the country. Relations between womens age at delivery and preterm birth appeared to be U-shaped. Increased preterm birth rates were also observed in women with lower education levelmore paritiesand previous history of preterm birth or abortion. CONCLUSION: Preterm birth rate decreased steadily from 1993-2005 in 10 counties (cities) but varied by areas of the country." @default.
• W67984190 created "2016-06-24" @default.
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• W67984190 date "2007-11-01" @default.
• W67984190 modified "2023-09-24" @default.
• W67984190 title "[Prevalence of preterm birth among singletons in 10 counties (cities) of China, 1993-2005]." @default.
• W67984190 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/18396653" @default.
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