The Karnofsky Performance Status Scale (KPS) was designed to measure the level of patient activity and medical care requirements. It is a general measure of patient independence and has been widely used as a general assessment of patient with cancer. Although there is a long history of use of the KPS for judging cancer patients, its reliability and validity have been assumed without formal investigation. The interrater reliability of the KPS was investigated in two ways, both of which gave evidence of moderately high reliability. The patients evaluated in their home were usually assigned a lower KPS score compared with a similar evaluation at the same time done in the outpatient clinic. Costruct validity of the KPS was demonstrated by strong correlation with several variables relating to physical function. On-study KPS score accurately predicted early death, but high initial KPS scores did not necessarily predict long survival. Patient deterioration with subsequent death within a few months could be predicted to a limited extent by a rapidly dropping KPS. These results suggest that the KPS has considerable validity as a global indicator of the functional status of patients with cancer and might be helpful for following other patients with chronic disease.

Data on religious belief, activity, and connections, and ratings of happiness, life satisfaction, and pain level were obtained periodically from 71 patients with advanced cancer. Religious belief showed substantial positive correlation with life satisfaction, and religious activity and connections were significantly correlated with both happiness and life satisfaction. Religious patients also reported significantly lower levels of pain, even though they were no less likely to report the presence of pain. Data from the 36 patients who have since died show no correlation between the religion variables and duration of survival. In general, the patients showed little change in religious belief over time. Religion seems to be an important source of support for many patients.

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