1 Symptoms, but ambulatory. Restricted in physically strenuous activity, but ambulatory and able to carry out work of a light or sedentary nature (e.g., light housework, office work). 2 In bed < 50% of the time. 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 In bed > 50% of the time. Capable of only limited self-care, confined to bed or chair more than 50% of waking hours. 4 100% bedridden. Complete ly disabled. Cannot carry on any self-care. Totally confined to bed or chair.