Table 1

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

Number of patients

Recruitment sites


Group 1


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


4 pulmonary rehabilitation centres in Switzerland, Germany and Austria

Internal consistency reliability and cross-sectional validity of CRQ formats

Group 3


One outpatient service of a University hospital and three private practices in Switzerland and Germany

Test-retest reliability of CRQ formats

Puhan et al. Health and Quality of Life Outcomes 2004 2:1   doi:10.1186/1477-7525-2-1

Open Data