6MWT* functional class

N (%)

Average distance, m ± SD**

I

32 (45.7)

437.8 ± 95.8

II

22 (31.4)

360.1 ± 96.4

III

13 (18.5)

248.4 ± 98.3

IV

3 (4.4)

150.1 ± 104.3