Table 2.

WHO performance score

Grade	Definition
0	Fully active, able to carry on all pre‐disease performance without restriction
1	Restricted in physically strenuous activity but ambulatory and able to carry out work of a light or sedentary nature, e.g. light house work, office work
2	Ambulatory and capable of all self‐care, but unable to carry out any work activities. Up and about more than 50% of waking hours
3	Capable of only limited self‐care, confined to bed or chair more than 50% of waking hours
4	Completely disabled. Cannot carry out any self‐care. Totally confined to bed or chair
5	Dead