![]() To account for interindividual variability due to the repeated measures taken on each subject, mixed linear regression models with an unstructured covariance matrix were used to assess the relationship between food price changes and purchasing decisions (price elasticity). Informed consent was obtained from all subjects, and this study was approved by the Institutional Review Board at the University of North Dakota. Based on our power analysis (discussed below), 80 subjects were recruited and completed this study, including 40 individuals participating in federal food assistance programs and 40 individuals not participating in these programs. To capture the full range of egg preferences within our sample, regularity of egg purchases, other than complete avoidance of eggs, was not used as an exclusion criterion in order. Exclusion criteria were health conditions or food practices that substantially limited food choice (including avoidance of eggs), current pregnancy, and unwillingness to comply with all study requirements. Inclusion criteria were women ≥18 y of age who were the primary grocery shopper for their household and who had children <18 y of age living in their household. Subjects were recruited from Grand Forks, ND, and surrounding areas using various media from October 2017 through May 2018, and interested individuals completed an online survey to determine eligibility.
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