Venerable but vigorous: the College of Physicians.
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In a previous article we described the development of two Guttman-scales for the self-assessment of functional health and sociability of old people. In this publication different aspects of scale-validity are examined. Together with corresponding expert-ratings and a measure of subjective health the two self-ratings are evaluated with regard to their relations to behavioral data. While the functional health scale reaches high coefficients of scalability and good validity, the sociability-scale still is in need of further improvement.
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