| With RP (n = 25) | Without RP (n = 51) | P value | ||
| Univariate | Multivariate | |||
| COPD | 18 (72%) | 26 (49%) | 0.001 | 0.01 |
| DM | 4 (16%) | 7 (13%) | 0.341 | 0.123 |
| stroke | 3 (12%) | 5 (10%) | 0.098 | 0.091 |
| OSAS | 2 (8%) | 3 (6%) | 0.087 | 0.765 |