Regression analysis between clinical characteristic and venous capacitance and return parameters
| Parameters | β1 | R2 | P value |
| MVO-age (mmHg/years) | 0.0324 | 0.0120 | 0.3120 |
| MVO-height (mmHg/m) | −1.8587 | 0.0024 | 0.6486 |
| MVO-BMI (mmHg/kg/m2) | 0.1052 | 0.0076 | 0.4198 |
| MVO-sitting SBP (mmHg/mm Hg) | 0.0589 | 0.0256 | 0.1408 |
| MVO-sitting DBP (mmHg/mm Hg) | 0.0892 | 0.0374 | 0.0741 |
| MVO-supine heart rate (mmHg/bpm) | −0.0565 | 0.0293 | 0.1148 |
| MVO-SBP difference (mmHg/mm Hg) | −0.0672 | 0.0161 | 0.2620 |
| MVO-DBP difference (mmHg/mm Hg) | −0.1348 | 0.0582 | 0.0311* |
| MVO-heart rate difference (mmHg/bpm) | 0.0208 | 0.0019 | 0.6968 |
| SVC-age (mmHg/years) | 0.0190 | 0.0034 | 0.5871 |
| SVC-height (mmHg/m) | −1.9265 | 0.0022 | 0.6661 |
| SVC-BMI (mmHg/kg/m2) | 0.0039 | 0.0009 | 0.7825 |
| SVC-sitting SBP (mmHg/mmHg) | 0.0055 | 0.0191 | 0.2037 |
| SVC-sitting DBP (mmHg/mmHg) | 0.1038 | 0.0424 | 0.0571 |
| SVC-supine heart rate (mmHg/bpm) | −0.0463 | 0.0162 | 0.2421 |
| SVC-SBP difference (mmHg/mmHg) | 0.0695 | 0.0150 | 0.2788 |
| SVC-DBP difference (mmHg/mmHg) | −0.1563 | 0.0681 | 0.0193* |
| SVC-heart rate difference (mmHg/bpm) | 0.0163 | 0.0010 | 0.7766 |
| MVO/SVC-age (years-1) | 0.0021 | 0.0312 | 0.1013 |
| MVO/SVC-height (m-1) | −0.0471 | 0.0009 | 0.7801 |
| MVO/SVC-BMI (m2/kg) | 0.0006 | 0.0196 | 0.2299 |
| MVO/SVC-sitting SBP (mmHg-1) | 0.0014 | 0.0081 | 0.4097 |
| MVO/SVC-sitting DBP (mmHg-1) | 0.0003 | 0.0003 | 0.8723 |
| MVO/SVC-supine heart rate (bpm-1) | −0.0028 | 0.0437 | 0.0546 |
| MVO/SVC-SBP difference (mmHg-1) | −0.0027 | 0.0154 | 0.2722 |
| MVO/SVC-DBP difference (mmHg-1) | −0.0019 | 0.0065 | 0.4751 |
| MVO/SVC-heart rate difference (bpm-1) | 0.0024 | 0.0149 | 0.2735 |
*P<0.05.
BMI, body mass index; DBP, diastolic blood pressure; MVO, maximum venous outflow; NS, not significant; SBP, systolic blood pressure; SVC, segmental venous capacitance.