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Table 1 Frequency of comorbid disease in validation cohort

From: Adaptation and validation of the Charlson Index for Read/OXMIS coded databases

Charlson Diagnostic category Weighted score in Charlson index [6] Number of patients in our dataset
AIDS 6 8 (0%)
Cerebrovascular disease 1 9,028 (4.4%)
Chronic pulmonary disease 1 27,698 (13.5%)
Congestive heart disease 1 9,217 (4.5%)
Dementia 1 3,624 (1.8%)
Diabetes 1 14,418 (7.0%)
Diabetes with complications 2 2,544 (1.2%)
Hemiplegia and paraplegia 2 505 (0.25%)
Mild liver disease 1 416 (0.2%)
Moderate or severe liver disease 3 96 (0.05%)
Myocardial infarction 1 6,512 (3.2%)
Peptic ulcer disease 1 6,943 (3.4%)
Peripheral vascular disease 1 6,731 (3.3%)
Renal disease 2 12,624 (6.1%)
Rheumatological disease 1 8,140 (3.9%)
Cancer 2 34,750 (16.9%)
Metastatic tumour 6 2,116 (1.0%)
No comorbid disease - 60,585 (29.4%)
Total 205,955
  1. * Patients can be counted more than twice if they have more than one comorbid disease, therefore the total will not equal 146 441 (the number of patients in the cohort)