0 - Fully activeAble to carry on all pre-disease performance without restriction
1 - Light restrictionsRestricted in strenuous activity, can do light work
2 - Major restrictionsCapable of all self-care but unable to carry out any work activities
3 - Limited Self-careCapable of only limited self-care, in bed or chair 50%+ of waking time
4 - Completely disabledCompletely disabled, cannot carry on any self-care