Table 3. Multivariate linear analyses for the effects of clinical characteristics, including chest CT parameters, on the 6MW distance (n = 217).
| Clinical characteristics | β | P-value | 95% CI |
|---|---|---|---|
| Model 1 | |||
| Age, years | -2.915 | < 0.001 | -1.08 –-1.75 |
| BSA, m2 | 88.524 | 0.006 | 25.16–151.88 |
| FEV1, % predicted | .138 | 0.694 | -0.55–0.83 |
| FEV1/FVC, % | .311 | 0.604 | -0.87–1.49 |
| SGRQ, total score | -1.388 | < 0.001 | -1.91 –-0.87 |
| mPA, mm | -2.427 | 0.065 | -5.00–0.15 |
| Model 2 | |||
| Age, years | -3.322 | < 0.001 | -4.53 –-2.11 |
| BSA, m2 | 65.785 | 0.047 | 0.80–130.77 |
| FEV1, % predicted | .194 | 0.583 | -0.50–0.89 |
| FEV1/FVC, % | .289 | 0.632 | -0.89–1.47 |
| SGRQ, total score | -1.403 | < 0.001 | -1.93 –-0.88 |
| Ao, mm | 1.469 | 0.245 | -1.02–3.95 |
| Model 3 | |||
| Age, years | -3.162 | < 0.001 | -4.31 –-2.02 |
| BSA, m2 | 76.917 | 0.015 | 15.19–138.65 |
| FEV1, % predicted | .181 | 0.603 | -0.51–0.87 |
| FEV1/FVC, % | .262 | 0.66 | -0.91–1.43 |
| SGRQ, total score | -1.389 | < 0.001 | -1.91 –-0.87 |
| mPA/Ao ratio | -107.717 | 0.017 | -195.69 –-19.74 |
CT, computed tomography; 6MW, 6-minute walking; CI, confidence interval; BSA, body-surface area; FEV1, forced expiratory volume in 1s; FVC, forced vital capacity; SGRQ, St. George's Respiratory Questionnaire; mPA, main pulmonary artery diameter; Ao, aorta diameter.