Validity of subjective assessment of changes in respiratory health status: a 30 year epidemiological study of workers in Paris.


The validity of scales used for subjective assessment of health, particularly transitional indices, is under discussion. The aim of the present study was to assess the concurrent and predictive validity of a simple estimate of long-term subjective assessment of respiratory health changes. A longitudinal study of 915 workers was conducted over 30 yrs, with… (More)


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