Abstract
Purpose: Comorbidity indices are often used to measure comorbidities in register-based research. We aimed to adapt the Charlson comorbidity index (CCI) to a Swedish setting. Methods: Four versions of the CCI were compared and evaluated by disease-specific experts. Results: We created a cohesive coding system for CCI to 1) harmonize the content between different international classification of disease codes (ICD-7,8,9,10), 2) delete incorrect codes, 3) enhance the distinction between mild, moderate or severe disease (and between diabetes with and without end-organ damage), 4) minimize duplication of codes, and 5) briefly explain the meaning of individual codes in writing. Conclusion: This work may provide an integrated and efficient coding algorithm for CCI to be used in medical register-based research in Sweden.
Original language | English |
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Pages (from-to) | 21-41 |
Number of pages | 21 |
Journal | Clinical Epidemiology |
Volume | 13 |
DOIs | |
Publication status | Published - 2021 |
Subject classification (UKÄ)
- Public Health, Global Health, Social Medicine and Epidemiology
Free keywords
- Charlson comorbidity score
- Comorbidity
- Disease
- Epidemiology
- Public health
- Sweden