The 9 questionnaires included:
For patients and caregivers:
• background information of COPD patients and their family caregivers
• disease-related knowledge scale, a modified version of
the Bristol COPD Knowledge Questionnaire (BCKQ)15
For patients only:
• Disease Characteristics of COPD questionnaire with 3
subdomains (patient history of COPD, dyspnea severity
measured by Borg categories scale,16 an evaluation index
for degree of breathing difficulty, and severity of
COPD using the Global Initiative for Chronic Obstructive
Lung Disease definition2)
• Functional status scale to measure patients’ ability to
perform activities of daily living using the Chinese version
of the Barthel index117,18
• Chinese-language COPD Health Belief scale,19 which
was modified from the original to measure 4 components
of the Champion Health Belief Model Scale20,21
• Modified COPD Self-Efficacy scale22 to assess patients’
confidence in their ability to avoid or manage breathing
difficulties in specific situations
• Patient Self-Care Behavior Scale23 modified based on a
combination of Orem’s Deficiency of Self-Care nursing
theory,24 a self-care behavior scale for heart failure patients, 25 international literature, and researchers’ clinical experience with COPD patients
For caregivers only:
• Family caregiver caring behavior scale revised from Family Caregivers of Cancer Patients Care-Taking Scale26
• Caregiver Reaction Assessment scale using the Chinese
translation of the Caregiver Reaction Assessment scale27
to assess caregivers’ perceptions of caregiving based on
actual work load