Multilingual chief complaint classification for syndromic surveillance: An experiment with Chinese chief complaints

Hsin Min Lu, Hsinchun Chen, Daniel Zeng, Chwan Chuen King, Fuh Yuan Shih, Tsung Shu Wu, Jin Yi Hsiao

Research output: Contribution to journalArticlepeer-review

20 Scopus citations


Purpose: Syndromic surveillance is aimed at early detection of disease outbreaks. An important data source for syndromic surveillance is free-text chief complaints (CCs), which may be recorded in different languages. For automated syndromic surveillance, CCs must be classified into predefined syndromic categories to facilitate subsequent data aggregation and analysis. Despite the fact that syndromic surveillance is largely an international effort, existing CC classification systems do not provide adequate support for processing CCs recorded in non-English languages. This paper reports a multilingual CC classification effort, focusing on CCs recorded in Chinese. Methods: We propose a novel Chinese CC classification system leveraging a Chinese-English translation module and an existing English CC classification approach. A set of 470 Chinese key phrases was extracted from about one million Chinese CC records using statistical methods. Based on the extracted key phrases, the system translates Chinese text into English and classifies the translated CCs to syndromic categories using an existing English CC classification system. Results: Compared to alternative approaches using a bilingual dictionary and a general-purpose machine translation system, our approach performs significantly better in terms of positive predictive value (PPV or precision), sensitivity (recall), specificity, and F measure (the harmonic mean of PPV and sensitivity), based on a computational experiment using real-world CC records. Conclusions: Our design provides satisfactory performance in classifying Chinese CCs into syndromic categories for public health surveillance. The overall design of our system also points out a potentially fruitful direction for multilingual CC systems that need to handle languages beyond English and Chinese.

Original languageEnglish (US)
Pages (from-to)308-320
Number of pages13
JournalInternational Journal of Medical Informatics
Issue number5
StatePublished - May 2009


  • Communicable disease control
  • Medical records
  • Multilingual chief complaint classification
  • Statistical pattern extraction
  • Syndromic surveillance

ASJC Scopus subject areas

  • Health Informatics


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