Comparison of the Dyspnoea-12 and Multidimensional Dyspnoea Profile in people with COPD.
We directly compared convergent, discriminant and concurrent validity of the Dyspnoea-12 (D-12) and Multidimensional Dyspnoea Profile (MDP) in people with chronic obstructive pulmonary disease.Breathlessness measures (D-12, MDP, visual analogue scales and descriptors) were completed for two focal periods (daily life and end of walk test). Instrument structure (D-12 and MDP item grouping) was assessed with factor analysis. Differences between airflow severity stage and focal periods (ANOVA, t-test and Chi-squared test), associations between D-12 and MDP (r, r2for static pulmonary function, 6-min walk test and self-reported measures of impairment) and individual consistency for comparable items of the D-12 and MDP (McNemar's test) were assessed.In 84 participants (mean±sd age 70±9 years, 47 males, forced expiratory volume in 1 s 48±17% predicted), item groupings were confirmed for both focal periods. Developer-recommended single and subdomain scores were highly correlated, and demonstrated similar convergent, discriminant and concurrent validity. Individual consistency differed between the D-12 and MDP according to item/item groups.At the level of developer-recommended single and subdomain scores, the D-12 and MDP share similar psychometric properties, but these instruments serve different purposes, do not assess the same sensations or emotions and are not interchangeable.
Health and Alliance for Research in Exercise, Nutrition and Activity (ARENA), Sansom Institute for Health Research, School of Health Sciences, University of South Australia, Adelaide, Australia marie.williams@unisa.edu.au.
Marie T
MT
Williams
School of Health Sciences, University of South Australia, Adelaide, Australia.
David
D
John
School of Health Sciences, University of South Australia, Adelaide, Australia.|Southern Adelaide Health Service and Repatriation General Hospital, Adelaide, Australia.
Peter
P
Frith
D000368:Aged; D001315:Australia; D003430:Cross-Sectional Studies; D004417:Dyspnea / Q000175:diagnosis*; D005163:Factor Analysis, Statistical; D005260:Female; D005541:Forced Expiratory Volume; D006801:Humans; D008297:Male; D008875:Middle Aged; D011594:Psychometrics / Q000379:methods; D029424:Pulmonary Disease, Chronic Obstructive / Q000150:complications* / Q000503:physiopathology*; D012720:Severity of Illness Index; D011795:Surveys and Questionnaires; D000070857:Walk Test