Effect of model of care delivery on mammography use among elderly breast cancer survivors

A new method of classifying prognostic comorbidity in longitudinal studies: Development and validation

Mary E. Charlson, Peter Pompei, Kathy L. Aleš et al. · Journal of Chronic Diseases · 1987 · 48.8K citations

Prognostic Assessment, Longitudinal Studies, Prognostic Comorbidity +11

Adapting a clinical comorbidity index for use with ICD-9-CM administrative databases

Richard A. Deyo · Journal of Clinical Epidemiology · 1992 · 10.4K citations

Primary Care, Psychiatry, Health Policy +13

Validation of a combined comorbidity index

Mary E. Charlson, Ted P. Szatrowski, Janey C. Peterson et al. · Journal of Clinical Epidemiology · 1994 · 6.4K citations

Psychiatry, Combined Comorbidity Index, Comorbid Psychiatric Disorder +6

What's the Relative Risk?

Jun Zhang, Kai Yu · JAMA · 1998 · 4K citations

Reducing Bias in Observational Studies Using Subclassification on the Propensity Score

Paul R. Rosenbaum, Donald B. Rubin · Journal of the American Statistical Association · 1984 · 3.2K citations

Treatment Effect, Preventive Cardiology, Quasi-experiment +17