Table 2.
Clinical characteristics separated by quartiles of 6-MWT distance in patients with CHF (mean ± SD).
| Variables | ≤45 m | 46–240 m | 241–360 m | >360 m | P value |
|---|---|---|---|---|---|
| Age (years) | 72.4 (10.6) | 72.9 (9.6) | 71.3 (8.8) | 64.9 (10.6) | <0.0001 |
| BMI (kg·m−2) | 27.5 (4.5) | 27.7 (5.2) | 28.5 (5.8) | 28.9 (6.8) | 0.002 |
| LVEF (%) | 32.0 (10.0) | 35.1 (10.7) | 34.6 (9.2) | 36.2 (9.3) | <0.0001 |
| FEV1/FVC (%) | 66.4 (17.7) | 67.5 (15.0) | 67.3 (16.5) | 68.8 (16.4) | 0.257 |
| Resting HR (beats·min−1) | 80 (36) | 75 (17) | 73 (17) | 72 (17) | <0.0001 |
| Resting systolic BP (mmHg) | 129 (29) | 134 (25) | 136 (23) | 135 (23) | <0.0001 |
| Resting diastolic BP (mmHg) | 74 (14) | 77 (15) | 77 (14) | 80 (14) | <0.0001 |
| QRS duration (ms) | 117 (31) | 119 (33) | 120 (32) | 114 (30) | 0.045 |
| Haemoglobin (g·dL−1) | 13.0 (1.9) | 13.2 (1.7) | 13.6 (1.5) | 14.1 (1.4) | <0.0001 |
| Log NT pro-BNP | 7.5 (1.4) | 7.3 (1.4) | 7.0 (1.2) | 6.5 (1.3) | <0.0001 |
| Sodium (mmol·L−1) | 138 (3.9) | 139 (3.8) | 139 (3.3) | 139 (3.0) | 0.241 |
| Potassium (mmol·L−1) | 4.4 (0.6) | 4.4 (0.5) | 4.4 (0.5) | 4.4 (0.5) | 0.382 |
| Urea (mmol·L−1) | 9.2 (5.0) | 8.5 (4.7) | 7.9 (3.9) | 6.7 (3.8) | <0.0001 |
| Creatinine (u·moL−1) | 125 (52) | 121 (49) | 116 (44) | 107 (65) | <0.0001 |