ARS | Publication request: ADULT OUTCOME EXPECTANCIES FOR PURCHASING FRUIT AND VEGETABLES: A VALIDATION

Submitted to: Meeting Abstract
Publication Type: Abstract Only
Publication Acceptance Date: July 13, 2006
Publication Date: July 13, 2006
Citation: Baranowski, T., Watson, K, Missaghian, M., Broadfoot, A., Cullen, K., Nicklas, T., Fisher, J., O'Donnell, S. 2006. Adult outcome expectancies for purchasing fruit and vegetables: A validation [abstract]. Fifth Conference of the International Society of Behavioral Nutrition and Physical Activity, July 13-16, 2006, Boston, Massachusetts. p. 123.

Technical Abstract: Purpose: To validate four scales for fruit and vegetable (FV) purchasing outcome expectancies. Methods: This was a cross-sectional survey of 161 individuals with a follow-up survey (to assess test retest reliability) six weeks later. An attempt was made to recruit an ethnically and socioeconomically diverse sample. Food shoppers with children were recruited in front of supermarkets and grocery stores to participate in the two phone interviews. New measures were created (based on previous intensive interviews) of outcome expectancies for purchasing fruit and vegetables. Classical Test Theory and Item Response Theory were used to conduct psychometric analysis. Validation was conducted against measures of home fruit and vegetable availability. Results: Single dimension scales were specified for fruit and for vegetable purchasing outcome expectancies, and for comparative (fresh vs. other) fruit and vegetable purchasing outcome expectancies. Item Response Theory parameter estimates revealed easily interpreted patterns in the sequence of items by difficulty of response. All scales were correlated with home FV availability after controlling for social desirability of response. Conclusions: These scales are available to help better understand family FV purchasing decisions.