Validity and reliability
The evaluation form was prepared in consultation with five academic nurses on the basis of previously reported
information about COPD. The internal consistency of the
sub-scales of the form used for the ratings of adaptation
levels – physiological, self-concept, and role-function – was examined by computing Cronbach’s alpha for each series of questions. Values for Cronbach’s alpha for the different sub-scales in this study were as follows: 0•91 for physiological adaptation, 0•86 for self-concept–physical self- adaptation, 0•88 for self-concept–personal self-adaptation, and 0•87 for role-function adaptation.