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| Parameter | EHS 1/2 group (n=35) | EHS 3/4 group (n=38) | t | P |
|---|---|---|---|---|
| PSV (cm/s) | 30.97 ± 5.16 | 22.81 ± 2.79 | 8.30 | <0.001 |
| EDV (cm/s) | 7.94 ± 1.57 | 3.28 ± 1.02 | 14.90 | <0.001 |
| RI | 0.95 ± 0.07 | 0.72 ± 0.05 | 16.03 | <0.001 |
