RT Journal Article
SR Electronic
T1 The PROactive instruments to measure physical activity in patients with chronic obstructive pulmonary disease
JF European Respiratory Journal
JO Eur Respir J
FD European Respiratory Society
SP ERJ-01830-2014
DO 10.1183/09031936.00183014
A1 Elena Gimeno-Santos
A1 Yogini Raste
A1 Heleen Demeyer
A1 Zafeiris Louvaris
A1 Corina de Jong
A1 Roberto A. Rabinovich
A1 Nicholas S. Hopkinson
A1 Michael I. Polkey
A1 Ioannis Vogiatzis
A1 Maggie Tabberer
A1 Fabienne Dobbels
A1 Nathalie Ivanoff
A1 Willem I. de Boer
A1 Thys van der Molen
A1 Karoly Kulich
A1 Ignasi Serra
A1 Xavier Basagaña
A1 Thierry Troosters
A1 Milo A. Puhan
A1 Niklas Karlsson
A1 Judith Garcia-Aymerich
YR 2015
UL http://erj.ersjournals.com/content/early/2015/05/28/09031936.00183014.abstract
AB No current patient-centred instrument captures all dimensions of physical activity in chronic obstructive pulmonary disease (COPD). Our objective was item reduction and initial validation of two instruments to measure physical activity in COPD.Physical activity was assessed in a 6-week, randomised, two-way cross-over, multicentre study using PROactive draft questionnaires (daily and clinical visit versions) and two activity monitors. Item reduction followed an iterative process including classical and Rasch model analyses, and input from patients and clinical experts.236 COPD patients from five European centres were included. Results indicated the concept of physical activity in COPD had two domains, labelled “amount” and “difficulty”. After item reduction, the daily PROactive instrument comprised nine items and the clinical visit contained 14. Both demonstrated good model fit (person separation index >0.7). Confirmatory factor analysis supported the bidimensional structure. Both instruments had good internal consistency (Cronbach's α>0.8), test–retest reliability (intraclass correlation coefficient ≥0.9) and exhibited moderate-to-high correlations (r>0.6) with related constructs and very low correlations (r<0.3) with unrelated constructs, providing evidence for construct validity.Daily and clinical visit “PROactive physical activity in COPD” instruments are hybrid tools combining a short patient-reported outcome questionnaire and two activity monitor variables which provide simple, valid and reliable measures of physical activity in COPD patients.Both PROactive hybrid tools are simple, valid, and reliable measures of physical activity in COPD patients http://ow.ly/LJqP8