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Table 1 Groups of COPD patients recruited for the adaptation and validation of the German CRQ

From: Self-administration and interviewer-administration of the German Chronic Respiratory Questionnaire: instrument development and assessment of validity and reliability in two randomised studies

  Number of patients Recruitment sites Objective
Group 1 44 4 pulmonary rehabilitation centres and one University hospital in Switzerland, Germany and Austria Pilot testing of CRQ formats during translation and adaptation process
Group 2 80 4 pulmonary rehabilitation centres in Switzerland, Germany and Austria Internal consistency reliability and cross-sectional validity of CRQ formats
Group 3 38 One outpatient service of a University hospital and three private practices in Switzerland and Germany Test-retest reliability of CRQ formats