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Demographic characteristics and basic diseases
| Subject | Cases (%) |
|---|---|
| Age (year, mean, SD) | 64.00 ± 20.00 |
| Male | 132 (70.60%) |
| Comorbidity | n (%) |
| Diabetes | 28 (14.98%) |
| Hypertension | 62 (33.16%) |
| Alzheimer disease | 18 (9.63%) |
| Structural lung diseases | 49 (26.20%) |
| Cardiac disease | 19 (10.16%) |
| Malignancy | 22 (11.76%) |
| Cerebrovascular diseases | 47 (25.13%) |
| Connective tissue disease | 9 (4.81%) |
| Tolerance of endotracheal tube | 14 (7.49%) |
| Long immobilization | 16 (8.56%) |
