Functional Comorbidity Index

Groll DL, To T, Bombardier C, Wright JG. The development of a comorbidity index with physical function as the outcome. J Clin Epidemiol. 2005;58(6):595-602.
Pubmed PMID: 15878473

Comorbidity measures for use with administrative data

Elixhauser A, Steiner C, Harris DR, Coffey RM. Comorbidity measures for use with administrative data. Med Care. 1998;36(1):8-27.
Pubmed PMID: 9431328

Charlson Index for Chronic Disease Costs Prediction in Primary Care Patients

Charlson ME, Charlson RE, Peterson JC, Marinopoulos SS, Briggs WM, Hollenberg JP. The Charlson comorbidity index is adapted to predict costs of chronic disease in primary care patients. J Clin Epidemiol. 2008;61(12):1234-40.
Pubmed PMID: 18619805

Charlson-Age Comorbidity Index

Charlson M, Szatrowski TP, Peterson J, Gold J. Validation of a combined comorbidity index. J Clin Epidemiol. 1994;47(11):1245-51.
Pubmed PMID: 7722560

Updated Charlson Index for Risk Adjustment in Hospital Discharge

Quan H, Li B, Couris CM, et al. Updating and validating the Charlson comorbidity index and score for risk adjustment in hospital discharge abstracts using data from 6 countries. Am J Epidemiol. 2011;173(6):676-82.
Pubmed PMID: 21330339

Charlson Weighted Index of Comorbidities

Charlson ME, Pompei P, Ales KL, Mackenzie CR. A new method of classifying prognostic comorbidity in longitudinal studies: development and validation. J Chronic Dis. 1987;40(5):373-83.
Pubmed PMID: 3558716
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