Prevalence of preterm birth according to birth weight group: A systematic review

Mariângela F. Silveira, Alicia Matijasevich, Bernardo L. Horta, Heloisa Bettiol, Marco Antônio Barbieri, Antonio A. Silva, Patricia H C Rondó, Abelardo N. Lunardelli, Marco A. Peres, Ricardo Q. Gurgel, Antônio L. Cunha, Luiza M. Calvano, Joffre Amin, Maria do C Leal, Ana Cristina Guimarães Matos, Ana Goretti Maranhão, Juan José Cortez-Escalante, Aluísio J D Barros, Fernando C. Barros, Cesar G. Victora

Research output: Contribution to journalArticlepeer-review

13 Scopus citations


Objective: To estimate the prevalence of preterm birth by categories of birth weight, and to obtain an equation to correct the estimates. Methods: Systematic review of the Brazilian literature published from 1990 to 2012, to identify studies with primary collection of data on birth weight and gestational age. Twelve studies were selected and contributed for tabulations of preterm prevalence according to 100 g birth weight categories. These results were combined using sex-specific fractional polynomial equations and the resulting curves were compared with results from the Live Birth Information System for the years 2000, 2005, 2010 and 2011. Results: For all birth weight categories, preterm prevalence estimates based on primary studies had a higher prevalence than those of the the Live Birth Information System. The prevalence reported by the Live Birth Information System was of 7.2% in 2010, about 38.0% lower than the estimated prevalence of 11.7% obtained with the correctional equation. Conclusions: Information reported by the Live Birth Information System on preterm prevalence does not reflect the true magnitude of the problem in Brazil, and should not be used without the correction factors proposed in the present analyses.

Original languageEnglish (US)
Pages (from-to)992-1003
Number of pages12
JournalRevista de Saude Publica
Issue number5
StatePublished - Oct 2013
Externally publishedYes


  • Birth certificates
  • Infant, low birth weight
  • Infant, premature
  • Prevalence
  • Review

ASJC Scopus subject areas

  • Public Health, Environmental and Occupational Health
  • General Medicine


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