Table 1. The modified Borg scale - a subjective estimate of the degree of fatigue.

Modified Borg scale
0	No breathlessness
0.5	Very, very slight (just noticeable)
1	Very slight
2	Slight breathlessness
3	Moderate
4	Somewhat severe
5	Severe breathlessness
6
7	Very severe breathlessness
8
9	Very, very severe (almost maximum)
10	Maximum