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Thesaurus and information

K Kayser, W Ramisch, H von Kenne

    Medical Informatics = Medecine Et Informatique
    |April 1, 1980
    PubMed
    Summary

    This study compares thesaurus structures for information retrieval. Facet structures offer optimal quantitative and semantic information for medical diagnoses, enhancing data transferability between systems like TDM and ICD.

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    Area of Science:

    • Medical Informatics
    • Information Science
    • Knowledge Representation

    Background:

    • Thesauri are crucial for organizing and retrieving medical information.
    • Different thesaurus structures (unclassified, hierarchical, facet) impact information content.
    • Quantitative and semantic aspects of thesauri require evaluation for optimal use.

    Purpose of the Study:

    • To analyze the quantitative and semantic information content of different thesaurus structures.
    • To determine the optimal thesaurus structure for medical diagnoses.
    • To compare the transferability of diagnoses between major medical classification systems.

    Main Methods:

    • Evaluation of thesauri without classification, with hierarchical structure, and with facet structure.
    • Quantitative and semi-quantitative computation of semantic information based on diagnostic importance.
    • Comparative analysis of TDM, ICD, and SNOP for diagnosis codification and transferability.

    Main Results:

    • The optimal thesaurus structure depends on the number and frequency of diagnoses and subdivisions.
    • Semantic information can be semi-quantitatively computed by designating importance levels within diagnoses.
    • Direct transferability between TDM and ICD was 70-80% for circulatory and respiratory systems, but only 20% for the nervous system.
    • Post-coordinated SNOP allowed codification of approximately 80% of TDM diagnoses.

    Conclusions:

    • Facet-structured thesauri offer advantages in quantitative and semantic information handling.
    • The choice of thesaurus structure significantly influences the efficiency of medical information retrieval and data exchange.
    • Understanding thesaurus structure impacts the accuracy and completeness of medical coding across different systems.

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