Baseline characteristics of patients and caregivers
| Characteristic | Patients n=13 (%) | Caregivers n=4 |
| Male sex, % | 7 (54) | 2 (50) |
| Caucasian race, % | 13 (100) | 4 (100) |
| Mean age, years | 68.1±7.2 | 63.3±7.7 |
| Supplemental oxygen | N/A | |
| None | 1 | |
| Exertion only | 5 | |
| Continuous | 7 | |
| Disease duration, years | 5.7±4.4 | N/A |