| Background: Moderate increase in physical activity (PA) may be helpful in preventing or
postponing the complications of type 2 diabetes mellitus (T2DM). The aim of this study was
to assess the psychometric properties of a health action process approach (HAPA)-based PA
inventory among T2DM patients.
Methods: In 2015, this cross-sectional study was carried out on 203 participants recruited by
convenience sampling in Isfahan, Iran. Content and face validity was confirmed by a panel of
experts. The comments noted by 9 outpatients on the inventory were also investigated. Then,
the items were administered to 203 T2DM patients. Construct validity was conducted using
exploratory and structural equation modeling confirmatory factor analyses. Reliability was also
assessed with Cronbach alpha and interclass correlation coefficient (ICC).
Results: Content validity was acceptable (CVR = 0.62, CVI = 0.89). Exploratory factor
analysis extracted seven factors (risk- perception, action self-efficacy, outcome expectancies,
maintenance self-efficacy, action and coping planning, behavioral intention, and recovery selfefficacy)
explaining 82.23% of the variation. The HAPA had an acceptable fit to the observations
(χ2 = 3.21, df = 3, P = 0.38; RMSEA = 0.06; AGFI = 0.90; PGFI = 0.12). The range of Cronbach alpha
and ICC for the scales was about 0.63 to 0.97 and 0.862 to 0.988, respectively.
Conclusion: The findings of the present study provided an initial support for the reliability and
validity of the HAPA-based PA inventory among patients with T2DM. |