Group | Cases (n) | Tei index | Left ventricular ejection fraction (%) | 6 MWT (m) |
Control group | 51 | 0.45 ± 0.13 | 48.19 ± 4.92 | 408 ± 50.41 |
Observation group | 51 | 0.33 ± 0.10 | 57.44 ± 4.15 | 496.15 ± 65.75 |