Homrich da Silva Clécio, Goldani Marcelo Zubaran, de Moura Silva Antônio Augusto, Agranonik Marilyn, Bettiol Heloísa, Barbieri Marco Antônio, Rona Roberto
Departamento de Pediatria e Puericultura da Faculdade de Medicina da Universidade Federal do Rio Grande do Sul, Porto Alegre, Rio Grande do Sul, Brazil.
Acta Paediatr. 2008 Aug;97(8):1019-23. doi: 10.1111/j.1651-2227.2008.00791.x. Epub 2008 Apr 29.
The aim of this study was to assess the rise in multiple births and its influence on trends of low birth weight (LBW) rates in Porto Alegre, Brazil.
This is a registry-based study of live births from 1994 to 2005 obtained from the national live birth information system. Chi-square tests for trends were assessed for LBW and multiple birth rates. The impact of multiple births on LBW trends was assessed by sequential modelling, including year and further adjustment for multiple births. Risk factors for multiple births were assessed using the Poisson regression.
A total of 263 252 live births were studied. The LBW rate increased from 9.70% to 9.88% (p < 0.001) and the multiple birth rate rose from 1.95% to 2.53% (p < 0.001). LBW rate increased among twins, from 57.14% to 63.46% (p = 0.001). The twin birth rate rose by 24.7%, while the rate of triplets or higher-order increased by 150%. Multiple births may be responsible for 23.9% of the increase in the LBW rate over the period. Mothers with higher levels of schooling, older mothers and mothers delivering in private hospitals were more likely to deliver multiple births.
It seems that both the increase in multiple births and in the LBW among multiple births contributed to this rise in overall LBW rate.
本研究旨在评估巴西阿雷格里港多胞胎出生率的上升及其对低出生体重（LBW）率趋势的影响。
这是一项基于登记处的研究，研究对象为1994年至2005年从国家活产信息系统获取的活产数据。对低出生体重率和多胞胎出生率进行了趋势的卡方检验。通过序贯建模评估多胞胎对低出生体重率趋势的影响，包括年份以及对多胞胎的进一步调整。使用泊松回归评估多胞胎的危险因素。
共研究了263252例活产。低出生体重率从9.70%升至9.88%（p<0.001），多胞胎出生率从1.95%升至2.53%（p<0.001）。双胞胎中的低出生体重率有所上升，从57.14%升至6
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