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BMC Medical Research Methodology
Published in: BMC Medical Research Methodology 1/2010

Open Access 01-12-2010 | Research article

Development and psychometric properties of a belief-based Physical Activity Questionnaire for Diabetic Patients (PAQ-DP)

Authors: Zeinab Ghazanfari, Shamsaddin Niknami, Fazlollah Ghofranipour, Ebrahim Hajizadeh, Ali Montazeri

Published in: BMC Medical Research Methodology | Issue 1/2010

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Abstract

Background

This study carried out to develop a scale for assessing diabetic patients' perceptions about physical activity and to test its psychometric properties (The Physical Activity Questionnaire for Diabetic Patients-PAQ-DP).

Methods

An item pool extracted from the Theory of Planned Behavior literature was generated. Then an expert panel evaluated the items by assessing content validity index and content validity ratio. Consequently exploratory factor analysis (EFA) was performed to indicate the scale constructs. In addition reliability analyses including internal consistency and test-retest analysis were carried out.

Results

In all a sample of 127 women with diabetes participated in the study. Twenty-two items were initially extracted from the literature. A six-factor solution (containing 19 items) emerged as a result of an exploratory factor analysis namely: instrumental attitude, subjective norm, perceived behavioral control, affective attitude, self-identity, and intention explaining 60.30% of the variance observed. Additional analyses indicated satisfactory results for internal consistency (Cronbach's alpha ranging from 0.54 to 0.8) and intraclass correlation coefficients (ranging from 0.40 to 0.92).

Conclusions

The Physical Activity Questionnaire for Diabetic Patients (PAQ-DP) is the first instrument that applies the Theory of Planned Behavior in its constructs. The findings indicated that the PAQ-DP is a reliable and valid measure for assessing physical activity perceptions and now is available and can be used in future studies.
Appendix
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Metadata
Title
Development and psychometric properties of a belief-based Physical Activity Questionnaire for Diabetic Patients (PAQ-DP)
Authors
Zeinab Ghazanfari
Shamsaddin Niknami
Fazlollah Ghofranipour
Ebrahim Hajizadeh
Ali Montazeri
Publication date
01-12-2010
Publisher
BioMed Central
Published in
BMC Medical Research Methodology / Issue 1/2010
Electronic ISSN: 1471-2288
DOI
https://doi.org/10.1186/1471-2288-10-104

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