To the Editor.
—In the study by Luft and Romano,1 equations derived from administrative data predicted mortality as well as equations derived from more costly specially abstracted clinical data in other studies. Notwithstanding their ability to predict outcome, however, equations derived from administrative data have important limitations: the data elements may depend greatly on physician judgment, and the data elements may be a consequence of care rather than a risk factor. For example, the use of internal mammary artery bypass grafts, delays between cardiac catheterization and
Hartz AJ, Kuhn EM, Kayser KL. Coronary Artery Bypass Graft Mortality: Patient Risk or Physician Practice? JAMA. 1993;270(24):2928. doi:10.1001/jama.1993.03510240040023
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