Because of the small proportion of cases with a Charlson Comorbidity score exceeding 3, the data have been truncated to 0, 1, 2, 3 (greater than or equal to 3). A score of 0 indicates "no comorbid conditions recorded", or none of the values shown below. Patients with a score of 0 could still have comorbidities if they are conditions that are not included in the mapping table below. Note that the patient's cancer is not directly reflected in the recorded score.
Two examples illustrating how the Charlson Score is summarized for the PUF data: If a patient had a myocardial infarction, diabetes, and renal disease, the cumulative score would be 4, and the value shown in the PUF would be 3. If a patient had severe liver disease, the value in the PUF would also be 3, since the Charlson Score of severe liver disease is 3.
Values reported in the PUF:
|0||Total Charlson Deyo Score of 0|
|1||Total Charlson-Deyo score of 1|
|2||Total Charlson-Deyo Score of 2|
|3||Total Charlson –Deyo Score of 3 or more|
Charlson Comorbidity Score Mapping Table:
|Congestive Heart Failure||1|
|Peripheral Vascular Disease||1|
|Chronic Pulmonary Disease||1|
|Peptic Ulcer Disease||1|
|Mild Liver Disease||1|
|Diabetes with Chronic Complications||2|
|Hemiplegia or Paraplegia||2|
|Moderate or Severe Liver Disease||3|
*Individual Charlson scores are not provided in the PUF. Instead, the Charlson scores are summed for each patient and categorized by a value of 0, 1, 2 and 3 or more. A zero score means they had none of the conditions in the mapping table. They could have had other comorbid conditions however.
1 Source: Deyo RA, Cherkin DC, Ciol MA. Adapting a clinical comorbidity index for use with ICD-9-CM administrative databases. Journal of Clinical Epidemiology 1992;45(6):613-619.
More information about the Charlson-Deyo Comorbidity Index may be found on the University of Manitoba's website: http://mchp-appserv.cpe.umanitoba.ca/viewConcept.php?conceptID=1098.