From: Predictive performance of comorbidity measures in administrative databases for diabetes cohorts
Measure | Definition | Data Source | Variable Categories for the Predictive Modela |
---|---|---|---|
Number of diagnoses | Identifies number of diagnosis codes, to the third digit. Minimum score is 0 and there is no maximum | Hospital records and physician billing claims | 0−2 (reference), 3–5, 6–9, 10 or more |
Charlson index | Summarizes diagnoses for 17 conditions. Total score can range from 0 to 32 | Hospital records and physician billing claims | 0−1 (reference), 2–3, 4–5, 6 or more |
Elixhauser index | Captures diagnoses for 31 conditions. No total score is produced | Hospital records and physician billing claims | Dummy variables (0 = absent; 1 = present) are used to define the 31 conditions |
Number of drugs | Identifies number of prescription drugs using six-digit AHFS codes. Total score can range from 0 to 125 | Prescription drug records | 0−1 (reference), 2–3, 4–5, 6 or more |
Chronic Disease Score (CDS) | Uses AHFS codes to identify number of different prescriptions for treating 17 conditions. Total score can range from 0 to 35 | Prescription drug records | 0−1 (reference), 2–3, 4–5, 6–7, 8 or more |