Table 3.
Test results before PR according to the severity of COPD and correlations with the 6MST
| Test parameters | Stage 1 and 2 COPD (n=60), mean ± SD | r | P-value | Stage 3 and 4 COPD (n=31), mean ± SD | r | P-value |
|---|---|---|---|---|---|---|
| 6MST (steps) | 502.6±145.9 | NA | NA | 461.1±154.5 | NA | NA |
| 6MWT (m) | 401.1±89.3 | 0.53 | P<0.0001 | 414.6±81.7 | 0.55 | P<0.005 |
| Power-VT (W) | 56.2±24.08 | 0.43 | P<0.005 | 44.5±20 | 0.22 | NS |
| VO2-VT (mL/min/kg) | 11.5±3.8 | 0.15 | NS | 11.1±2.2 | 0.52 | P<0.05 |
| Power-max (W) | 92.3±32.3 | 0.45 | P<0.0005 | 73.9±30 | 0.44 | P<0.05 |
| VO2 max (mL/min/kg) | 15.7±5.3 | 0.29 | NS | 14.4±3.7 | 0.62 | P<0.005 |
Abbreviations: PR, pulmonary rehabilitation; 6MST, 6-minute stepper test; 6MWT, 6-minute walk test; VO2-VT, oxygen consumption at ventilatory threshold; VO2 max, oxygen consumption at maximum effort; Power-VT, Power at ventilatory threshold; Power-max, Power at maximum effort; NA, not applicable; NS, not significant.