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Duke Case-Mix System (DUMIX) for ambulatory health care.

Publication ,  Journal Article
Parkerson, GR; Michener, JL; Yarnall, KS; Hammond, WE
Published in: J Clin Epidemiol
December 1997

The Duke Case-Mix System (DUMIX), which combines age, gender, patient-reported perceived and physical health status, and provider-reported or auditor-reported severity of illness to classify patients by their risk of high future utilization, explained 17.1% of the variance in future clinic charges and 16.6% of the variance in return visits. When a random half of 413 ambulatory adults were classified into four risk classes by predictive regression coefficients from the other half, there was a stepwise increase in actual future utilization by risk class. The most accurate classification was for Class 4 (highest risk) patients, with a sensitivity of 40.8%, specificity of 82.1%, and likelihood ratio of 2.3. These 23.7% of patients accounted for 44.2% of charges for all patients. When predictive coefficients from this population were used to classify a different group of 206 ambulatory adults, past utilization also increased in stepwise order by case-mix class.

Duke Scholars

Published In

J Clin Epidemiol

DOI

ISSN

0895-4356

Publication Date

December 1997

Volume

50

Issue

12

Start / End Page

1385 / 1394

Location

United States

Related Subject Headings

  • Surveys and Questionnaires
  • Severity of Illness Index
  • Retrospective Studies
  • Reproducibility of Results
  • Random Allocation
  • Predictive Value of Tests
  • Middle Aged
  • Managed Care Programs
  • Male
  • Humans
 

Citation

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MLA
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Parkerson, G. R., Michener, J. L., Yarnall, K. S., & Hammond, W. E. (1997). Duke Case-Mix System (DUMIX) for ambulatory health care. J Clin Epidemiol, 50(12), 1385–1394. https://doi.org/10.1016/s0895-4356(97)00217-5
Parkerson, G. R., J. L. Michener, K. S. Yarnall, and W. E. Hammond. “Duke Case-Mix System (DUMIX) for ambulatory health care.J Clin Epidemiol 50, no. 12 (December 1997): 1385–94. https://doi.org/10.1016/s0895-4356(97)00217-5.
Parkerson GR, Michener JL, Yarnall KS, Hammond WE. Duke Case-Mix System (DUMIX) for ambulatory health care. J Clin Epidemiol. 1997 Dec;50(12):1385–94.
Parkerson, G. R., et al. “Duke Case-Mix System (DUMIX) for ambulatory health care.J Clin Epidemiol, vol. 50, no. 12, Dec. 1997, pp. 1385–94. Pubmed, doi:10.1016/s0895-4356(97)00217-5.
Parkerson GR, Michener JL, Yarnall KS, Hammond WE. Duke Case-Mix System (DUMIX) for ambulatory health care. J Clin Epidemiol. 1997 Dec;50(12):1385–1394.
Journal cover image

Published In

J Clin Epidemiol

DOI

ISSN

0895-4356

Publication Date

December 1997

Volume

50

Issue

12

Start / End Page

1385 / 1394

Location

United States

Related Subject Headings

  • Surveys and Questionnaires
  • Severity of Illness Index
  • Retrospective Studies
  • Reproducibility of Results
  • Random Allocation
  • Predictive Value of Tests
  • Middle Aged
  • Managed Care Programs
  • Male
  • Humans