Table 3.

Variables of the original and modified Charlson Comorbidity Indices

Charlson Comorbidity Index (CCI)*	Modified CCI (mCCI)**
Conditions with assigned weight of 1	Conditions with assigned weight of 1
Cerebrovascular disease Chronic pulmonary disease Congestive heart failure Connective tissue disease Dementia Diabetes mellitus Mild liver disease Myocardial infarct Peripheral vascular disease Ulcer disease	Chronic obstructive pulmonary disease Congestive heart failure Diabetes mellitus Peripheral vascular disease or pain at rest Myocardial infarction Transient ischemic attack or stroke
Conditions with assigned weight of 2	Conditions with assigned weight of 2
Any tumour Diabetes with end organ damage Hemiplegia Leukaemia Lymphoma Moderate or severe renal disease	Hemiplegia Renal failure
Conditions with assigned weight of 3	Conditions with assigned weight of 3
Moderate or severe liver disease	Ascites or oesophageal varices (indicate liver disease)
Conditions with assigned weight of 6	Conditions with assigned weight of 6
AIDS Metastatic solid tumour	Disseminated cancer

Notes. AIDS, Acquired Immunodeficiency Syndrome.

^*The original CCI by Charlson et al.¹¹

^**The mCCI used in orthopaedics by Lakomkin et al.⁴⁴