Psychometric Evaluation of the Short Form of Situational Influences Scale for Stretching Exercise among Office Employees Based on the Health Promotion Model

Situational influences can facilitate or impede stretching exercise behaviours. However, since there is no measurement to assess situational influences among office employees, it might be difficult to understand the role of situational influences on stretching exercises. The current study aimed to evaluate the psychometric characteristics of Short Form of Situational influences Scale for predicting Stretching Exercise among office employers based on the Health Promotion Model (HPM).
By multistage cluster sampling method, this cross-sectional study was conducted among 385 office employees selected from the health networks at Shahid Beheshti University of Medical Sciences of Iran (SBUMS) who were assessed through the Short Form of Situational influences Scale. Exploratory factor analysis (EFA), confirmatory factor analysis (CFA), and Cronbach’s alpha were employed.
The mean age of the office employees was 39.4±7.76 years. Content Validity Index (CVI) and Content Validity Ratio (CVR) of each question were greater than 0.79. The result of EFA with principal component analysis showed one factor (Situational influences) with 43.6% cumulative variance and KMO with 90.4% (P < 0.001). This was a good fit index in CFA. The reliability of the questionnaire was confirmed through acceptable Cronbach’s alpha (α = 0.79). Regarding CFA, the result showed REMSEA = 0.048, GFI = 0.978, AGFI = 0.986 confirmed with Cronbach’s alpha (α = 79 %) and ICC =0.71 95% CI (0.69, 0.79).
The current study revealed that the Short Form of Situational influences Scale for Stretching Exercise is a valid instrument. Therefore, it can be used as a reliable and valid instrument to investigate Stretching Exercise behaviours among office employers.