Grade 1

Grade 2

Grade 3

p-value

Left atrial volume (mean, ml)

48.74

57.36

69.2

<0.01

Left atrial volume index (mean, ml/m²)

30.21

33.98

40.77

<0.01

Ejection fraction (mean, %)

36.59

30.19

22.14

<0.01