Development and validation of the Chronic Obstructive Pulmonary Disease Assessment Questionnaire (COPD-AQ).
OBJECTIVE
To develop a practical patient-completed chronic obstructive pulmonary disease assessment questionnaire (COPD-AQ) to improve COPD assessment and management in primary care, based on the concept of COPD stability.


METHODS
An Expert Working Group defined parameters of COPD stability and a 10-item Physician's Global Assessment was established. A 21-item COPD-AQ was developed and validated in a cross-sectional, non-randomised study of patients with COPD (n=395). Items most discriminative of stability status (stable/unstable) were selected to produce a 5-item COPD-AQ, which was then validated.


RESULTS
In the development sample, internal consistency reliability of the 5-item COPD-AQ was 0.74 (n=296). The COPD-AQ discriminated between stability groups based on physician assessment (F=44.26; p<0.0001) and post-bronchodilator spirometry measures (F=2.92; p<0.05). A questionnaire score >20 (range: 5.0-25.0) had a specificity of 82.9% and sensitivity of 64.7%.


CONCLUSIONS
The 5-item COPD-AQ proved a practical tool for assessing COPD status and was sufficiently simple for routine clinical use. However, overall validation was limited by small numbers of patients in the validation sample. Difficulties also existed over using the term 'stability' to define COPD status. COPD-AQ was not progressed further, but this work will prove valuable in the future development of a global questionnaire to improve COPD management in primary care.
Bailey
William C
WC
University of Alabama Lung Health Center, University of Alabama, Birmingham, AL 35249, USA. wcbailey@uab.edu
Sciurba
Frank C
FC
Hanania
Nicola A
NA
Donohue
James F
JF
Ferguson
Gary T
GT
Zibrak
Joseph D
JD
Sharafkhaneh
Amir
A
Marcus
Philip
P
Rosa
Kathleen
K
Piault
Elisabeth C
EC
Martinez
Fernando J
FJ
D000368:Aged; D018450:Disease Progression; D006801:Humans; D008875:Middle Aged; D011237:Predictive Value of Tests; D029424:Pulmonary Disease, Chronic Obstructive / Q000175:diagnosis*; D012372:ROC Curve; D012720:Severity of Illness Index; D011795:Surveys and Questionnaires