Chronic conditions at baseline according to the Charlson Index in 128 chronic obstructive pulmonary disease patients starting long-term oxygen therapy
| Congestive heart failure | 17 (13) |
| Diabetes | 11 (9) |
| Myocardial infarction | 9 (7) |
| Mild liver disease | 9 (7) |
| Peripheral vascular disease | 4 (3) |
| Peptic ulcer disease | 3 (2) |
| Malignant neoplasm (not metastatic) | 3 (2) |
| Renal disease | 2 (2) |
| Dementia | 2 (2) |
| Leukaemia | 1 (1) |
| Cerebrovascular disease | 1 (1) |
| Diabetes with chronic complications | 1 (1) |
Data presented as n (%).