Comparison of discriminative properties among disease-specific questionnaires for measuring health-related quality of life in patients with chronic obstructive pulmonary disease.

Three disease-specific, health-related quality of life (HRQL) questionnaires have been introduced to assess patients with chronic obstructive pulmonary disease (COPD): the St. George's Respiratory Questionnaire (SGRQ), the Breathing Problems Questionnaire (BPQ), and the Chronic Respiratory Disease Questionnaire (CRQ).

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