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