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Psychometric properties of the Physical Activity Scale for the Elderly in Chinese patients with COPD

Authors Tao YX, Wang L, Dong XY, Zheng H, Zheng YS, Tang XY, Zhao Y, Zhang Q

Received 26 August 2016

Accepted for publication 9 November 2016

Published 22 December 2016 Volume 2017:12 Pages 105—114

DOI https://doi.org/10.2147/COPD.S120700

Checked for plagiarism Yes

Review by Single-blind

Peer reviewers approved by Dr Amy Norman

Peer reviewer comments 2

Editor who approved publication: Dr Richard Russell

Video abstract presented by Yue Zhao.

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Yan-xia Tao,1,* Lan Wang,1,* Xiao-yan Dong,1 Hong Zheng,2 Ya-shu Zheng,2 Xing-yue Tang,1 Yue Zhao,1 Qing Zhang1

1School of Nursing, Tianjin Medical University, 2Department of Respiratory Care, Tianjin First Center Hospital, Tianjin, People’s Republic of China

*These authors contributed equally to this work

Background:
For patients with COPD, physical activity (PA) is recommended as the core component of pulmonary rehabilitation, but there is lack of a validated questionnaire for assessing the PA effectively.
Aim: To evaluate the reliability and validity of the Chinese version of Physical Activity Scale for the Elderly (PASE-C) in patients with COPD.
Methods: A cross-sectional study was conducted with 167 outpatients aged 60 years or older with COPD. Test-retest reliability and internal consistency were calculated by intraclass correlation coefficient (ICC) and Cronbach’s coefficient α, respectively. Validity was evaluated by correlation with the International Physical Activity Questionnaire-Short (IPAQ-S), data of pedometer, Self-Efficacy for Managing Chronic Disease 6-Item Scale (SES6), Hospital Anxiety and Depression Scale (HADS), Medical Outcomes Study 36-Item Short Form Health Survey (SF-36), grip strength, and disease characteristics.
Results: The PASE-C had an excellent seven-day test-retest reliability (ICC=0.98) and an acceptable internal consistency (Cronbach’s α=0.71). The content validity was supported by an item-content validity index, a scale-content validity index/universal agreement, and a scale-content validity index/average value of 0.70-1, 0.70, and 0.93, respectively. Concurrent validity was tested by correlation with IPAQ-S (r=0.651). Criterion validity was confirmed by correlation with the walking steps (r=0.611) and energy expenditure (r=0.493). For construct validity, PASE-C had correlations with SES6 (r=0.396), HADS for depression (r=-0.234), seven subscales of SF-36 (r=0.182-0.525), grip strength (r=0.341), and disease characteristics including the duration of COPD (r=-0.215), modified British Medical Research Council scale (r=-0.354), forced expiratory volume in one second as percentage of predicted (r=0.307), and Global Initiative for Chronic Obstructive Lung Disease grade (r=-0.264), with a good construct validity (all P<0.05).
Conclusion: The PASE-C has acceptable reliability and validity for patients aged 60 years or older with COPD, and it can be used as a valid tool to measure the PA of patients with COPD in the People’s Republic of China.

Keywords: Physical Activity Scale for the Elderly, COPD, reliability, validity, physical activity, elderly

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