Grade 0
Fully active
Able to carry on all pre-disease performance without restriction
Grade 1
Restricted and physically strenuous activity but ambulatory and able to carry out work of a light or sedentary nature
Grade 2
Ambulatory and capable of all self-care but unable to carry out any work activities
Ambulatory for greater than 50% of waking hours
Grade 3
Capable of only limited self-care
Confined to bed or chair for greater than 50% of waking hours
Grade 4
Completely disabled
Cannot carry on any self care
Totally confined to bed or chair
Grade 5
Dead