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Evaluating diagnostic accuracy in appendicitis using administrative data.

David R Flum1, Thomas D Koepsell

  • 1Department of Surgery, University of Washington, School of Medicine, Seattle, WA 98195-7183, USA. daveflum@u.washington.edu

The Journal of Surgical Research
|February 1, 2005
PubMed
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Administrative data accurately detect appendicitis but poorly identify negative appendectomies (NA). This limits its use for quality assessment in appendectomy care.

Area of Science:

  • Health Services Research
  • Surgical Quality Improvement
  • Health Informatics

Background:

  • Administrative data are used for healthcare quality assessment.
  • The validity of administrative data for appendicitis management quality assessment is unknown.
  • This study evaluated administrative data accuracy for identifying appendicitis vs. negative appendectomy (NA).

Purpose of the Study:

  • To assess the validity of administrative data research techniques.
  • To determine accuracy in identifying patients with appendicitis versus those with a negative appendectomy (NA).

Main Methods:

  • Retrospective study of 1823 appendectomies (1991-1999).
  • Compared administrative codes with medical record data.
  • Evaluated sensitivity, specificity, and predictive values.

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Main Results:

  • Administrative data identified appendicitis with high sensitivity (98.6%).
  • Negative appendectomies (NA) were poorly identified (specificity 48.6%, NPV 70.4%).
  • Over half of clinical NAs were missed; many incidental appendectomies were misclassified.

Conclusions:

  • Administrative data show excellent sensitivity for appendicitis detection.
  • Administrative data have limited adequacy for identifying negative appendectomies (NA).
  • Reconsider using this technique as a quality measure for appendectomy care.