References

Clinical symptoms and comorbidity: significance for the prognostic classification of cancer

10.1002/(sici)1097-0142(19960301)77:5<834::aid-cncr5>3.0.co;2-e · 1996 · External reference

Differential prognostic impact of comorbidity

10.1200/jco.2004.08.040 · 2004 · External reference

Surveillance Epidemiology and End Results (SEER) program

2009 · External reference

Comorbidities and cancer

2000 · External reference

The impact of co-morbidity on life expectancy among men with localized prostate cancer

10.1016/s0022-5347(01)65964-0 · 1996 · External reference

Comorbidity and age as predictors of risk for early mortality of male and female colon carcinoma patients—a population-based study

10.1002/(sici)1097-0142(19980601)82:11<2123::aid-cncr6>3.0.co;2-w · 1998 · External reference

Cancer, comorbidities, and health-related quality of life of older adults

2008 · External reference

Cancer survivorship and aging: moving the science forward

10.1002/cncr.23942 · 2008 · External reference

The changing prevalence of comorbidity across the age spectrum

10.1016/j.critrevonc.2008.01.013 · 2008 · External reference

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

10.1016/0021-9681(87)90171-8 · 1987 · External reference

Measurement and impact of comorbidity in older cancer patients

10.1016/s1040-8428(00)00090-1 · 2000 · External reference

A new simplified comorbidity score as a prognostic factor in non-small-cell lung cancer patients: description and comparison with the Charlson's index

10.1038/sj.bjc.6602836 · 2005 · External reference

The importance of classifying initial co-morbidity in evaluating the outcome of diabetes mellitus

10.1016/0021-9681(74)90017-4 · 1974 · External reference

Prognostic importance of comorbidity in a hospital-based cancer registry

10.1001/jama.291.20.2441 · 2004 · External reference

Validation of a comorbidity education program

2001 · External reference

A new look at the statistical model identification

10.1109/tac.1974.1100705 · 1974 · External reference

Unresolved reference

2009 · External reference

Tutorials in biostatistics. Multivariable prognostic models: issues in developing models, evaluating assumptions and adequacy, and measuring and reducing errors

10.1002/(sici)1097-0258(19960229)15:4<361::aid-sim168>3.0.co;2-4 · 1996 · External reference

Inclusion of comorbidity into oncology data registries

1999 · External reference

Serious co-morbidity among unselected cancer patients newly diagnosed in the southeastern part of The Netherlands in 1993–1996

10.1016/s0895-4356(99)00098-0 · 1999 · External reference

Cross-national comparative performance of three versions of the ICD-10 Charlson index

10.1097/mlr.0b013e3181484347 · 2007 · External reference

Evaluation of two competing methods for calculating Charlson's comorbidity index when analyzing short-term mortality using administrative data

10.1016/s0895-4356(97)00091-7 · 1997 · External reference

Searching for an improved clinical comorbidity index for use with ICD-9-CM administrative data

10.1016/0895-4356(95)00564-1 · 1996 · External reference

Practical considerations on the use of the Charlson comorbidity index with administrative data bases

10.1016/s0895-4356(96)00271-5 · 1996 · External reference

A comparison of the claims-based ICD-9-CM and the chart-based approaches to classifying comorbidity and complications by hospital-based cancer registrars

2006 · External reference

Comorbid and clinical determinants of prognosis in endometrial cancer

10.1001/archinte.1984.04400010120020 · 1984 · External reference

The effect of comorbidity on 3-year survival of women with primary breast cancer

10.7326/0003-4819-120-2-199401150-00002 · 1994 · External reference

Comparison of the performance of two comorbidity measures, with and without information from prior hospitalizations

10.1097/00005650-200107000-00009 · 2001 · External reference

Comorbidity measures for use with administrative data

10.1097/00005650-199801000-00004 · 1998 · External reference

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

10.1016/0895-4356(92)90133-8 · 1992 · External reference

The contribution of longitudinal comorbidity measurements to survival analysis

10.1097/mlr.0b013e318197929c · 2009 · External reference

The incidence and impact of comorbidity diagnosed after the onset of head and neck cancer

10.1001/archotol.134.10.1045 · 2008 · External reference