Appendix C. WHO performance status classification
The WHO performance status classification categorises patients as:
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0: able to carry out all normal activity without restriction
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1: restricted in strenuous activity but ambulatory and able to carry out light work
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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
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3: symptomatic and in a chair or in bed for greater than 50% of the day but not bedridden
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4: completely disabled; cannot carry out any self-care; totally confined to bed or chair.