Charlson Comorbidity Index inter-rater agreement
| Charlson Comorbidity Index | Coded records (n) | Audited records (n) | % agreement | κ coefficient | 95% CI | Prob >Z |
| Congestive heart failure | 15 | 28 | 83.0 | 0.51 | 0.32 to 0.70 | <0.001 |
| Cerebrovascular disease | 2 | 4 | 96.0 | 0.32 | −0.18 to 0.81 | <0.001 |
| Diabetes mellitus | 10 | 15 | 90.0 | 0.32 | −0.06 to 0.58 | <0.001 |
| Diabetes mellitus with end-organ damage | 21 | 11 | 72.6 | 0.64 | 0.44 to 0.84 | <0.001 |
| Dementia | 0 | 5 | 95.0 | 0.00 | – | – |
| Connective tissue disease | 0 | 4 | 96.0 | 0.00 | – | – |
| AIDS | 0 | 0 | / | / | / | / |
| Mild liver disease | 3 | 16 | 83.0 | 0.06 | −0.12 to 0.24 | 0.203 |
| Metastatic solid tumour | 10 | 9 | 95.0 | 0.71 | 0.47 to 0.95 | <0.001 |
| Any solid tumour | 16 | 15 | 85.0 | 0.43 | 0.19 to 0.67 | <0.001 |
| Myocardial infarction | 20 | 25 | 79.0 | 0.40 | 0.19 to 0.61 | <0.001 |
| Paraplegia | 1 | 4 | 95.0 | −0.02 | −0.05 to 0.02 | 0.581 |
| Gastric ulcer disease | 1 | 20 | 79.0 | −0.02 | −0.06 to 0.02 | 0.692 |
| Chronic pulmonary disease | 13 | 32 | 79.0 | 0.43 | 0.24 to 0.61 | <0.001 |
| Peripheral vascular disease | 3 | 10 | 93.0 | 0.44 | 0.10 to 0.77 | <0.001 |
| Renal disease | 22 | 21 | 85.0 | 0.56 | 0.36 to 0.76 | <0.001 |
| Moderate to severe liver disease | 1 | 4 | 95.0 | −0.02 | −0.05 to 0.02 | 0.581 |
| Leukaemia | 1 | 2 | 97.0 | −0.01 | −0.04 to 0.02 | 0.557 |
| Lymphoma | 0 | 1 | 99.0 | 0.00 | – | |
Inter-rater agreement in Charlson Comorbidity Index as specified by kappa (κ) values between audited data and coded data by disease.