Subjective and objective data are distinct types of information. Objective measures may be more suitable in detecting treatment effects. Subjective information is necessary to complete the QOL picture and to enhance the interpretation of objective data.

Patients who meet any of these criteria may be more likely to have higher needs, which has implications for clinical practice and audit. Assessment of needs for care by using the CAN provides a good overall measure of the number and the severity of a patient's problems in several key areas of everyday life.

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