Investigating the Reliability and Validity of the Power of Food Scale (PFS)
Subject Areas : Educationalemad ashrafi 1 , mohsen kachooei 2 , mahsa ghazaghi 3
1 - عضو هیأت علمی، گروه روان‌شناسی، دانشکدۀ علوم انسانی، دانشگاه علم و فرهنگ، تهران، ایران
2 - دانشجوی دکتری روان‌شناسی سلامت، گروه روان‌شناسی بالینی، واحد علوم پزشکی تهران، دانشگاه آزاد اسلامی، تهران، ایران
3 - کارشناسی روان‌شناسی، دانشگاه علم و فرهنگ، تهران، ایران
Keywords: Power of Food Scale (PFS), food environment, eating behavior, confirmatory factor analysis, Students,
Abstract :
The present study aimed at investigating the reliability and validity of the Power of Food Scale (PFS) (Lowe, Butryn, Didie, Annunziato, Thomas et al., 2009) among Iranian students. 701 students, as participants, completed PFS, external eating subscale of Dutch Eating Behavior Questionnaire (DEBQ) (Van Strien, Frijters, Bergers & Defares, 1986) and the Restraint Scale (RS) (Herman & Polivy, 1980). To evaluate validity of the scale construct, confirmatory factor analysis was used. Also, Pearson correlation was used to establish convergent and discriminant validity between PFS and the External Eating subscale of DEBQ, and between PFS and RS. The results of the confirmatory factor analysis showed that the current model of PFS along with three subscales and a total aggregate score fit the data well. PFS Cronbach’s alpha was 0.88 and a four-month test-retest PFS score was 0.65. Also, correlations between PFS and External Eating Subscale of DEBQ (r=0.67 P < 0.01) PFS and RS (r=0.24 P < 0.01) indicated an appropriate convergent and discriminant validity. The Power of Food Scale (PFS) is a brief and useful tool developed to assess the psychological impact of today food-abundant environments. This scale can be used to study eating behavior and also differences between homeostatic and hedonic hunger.
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