title: Use of Medical Subject Headings (MeSH) in Portuguese for categorizing web-based healthcare content.
abstract: BACKGROUND
  Internet users are increasingly using the worldwide web to search for information relating to their health. This situation makes it necessary to create specialized tools capable of supporting users in their searches.
  
  
  OBJECTIVE
  To apply and compare strategies that were developed to investigate the use of the Portuguese version of Medical Subject Headings (MeSH) for constructing an automated classifier for Brazilian Portuguese-language web-based content within or outside of the field of healthcare, focusing on the lay public.
  
  
  METHODS
  3658 Brazilian web pages were used to train the classifier and 606 Brazilian web pages were used to validate it. The strategies proposed were constructed using content-based vector methods for text classification, such that Naive Bayes was used for the task of classifying vector patterns with characteristics obtained through the proposed strategies.
  
  
  RESULTS
  A strategy named InDeCS was developed specifically to adapt MeSH for the problem that was put forward. This approach achieved better accuracy for this pattern classification task (0.94 sensitivity, specificity and area under the ROC curve).
  
  
  CONCLUSIONS
  Because of the significant results achieved by InDeCS, this tool has been successfully applied to the Brazilian healthcare search portal known as Busca Saúde. Furthermore, it could be shown that MeSH presents important results when used for the task of classifying web-based content focusing on the lay public. It was also possible to show from this study that MeSH was able to map out mutable non-deterministic characteristics of the web.
authors.affiliation: Departamento de Informática em Saúde, Universidade Federal de São Paulo, Rua Botucatu 862, Vila Clementino, São Paulo, SP, Brazil. fmancini@unifesp.br
authors.forename: Felipe
authors.initials: F
authors.lastname: Mancini
authors.forename: Fernando Sequeira
authors.initials: FS
authors.lastname: Sousa
authors.forename: Fábio Oliveira
authors.initials: FO
authors.lastname: Teixeira
authors.forename: Alex Esteves Jacoud
authors.initials: AE
authors.lastname: Falcão
authors.forename: Anderson Diniz
authors.initials: AD
authors.lastname: Hummel
authors.forename: Thiago Martini
authors.initials: TM
authors.lastname: da Costa
authors.forename: Pável Pereira
authors.initials: PP
authors.lastname: Calado
authors.forename: Luciano Vieira
authors.initials: LV
authors.lastname: de Araújo
authors.forename: Ivan Torres
authors.initials: IT
authors.lastname: Pisa
mesh_terms: D001938:Brazil; D003695:Delivery of Health Care; D016247:Information Storage and Retrieval; D020407:Internet; D016239:MEDLINE; D008490:Medical Informatics / Q000379:methods*; D046650:Medical Subject Headings