| tudies on the association between socioeconomic factors and food purchasing behavior have tended to rely on food expenditure data obtained through participant self-reports(1). However, self-reported expenditures have only rarely been compared to objective measures such as store and restaurant receipts collected over a given period of time(2--9). In addition, few receipt-based studies have addressed the disparities in the purchases of healthy or unhealthy foods across different socioeconomic status (SES) groups(3; 8).;The Seattle Obesity Study II (SOS II) collected store and restaurant receipts for 449 households over a period of 2 weeks. Participants were asked to report their monthly food expenditures for foods at home and away from home at the household level. The purpose of the present analyses was to: a) compare household food expenditures obtained from self-report vs. food shopping receipt data, using a number of validation techniques such as Pearson correlation, quintile kappa coefficient, and Bland-Altman method; b) examine socioeconomic trends in food expenditures using data from both methods: food shopping receipts vs. self-reports; c) to further examine SES trends in household food expenditures at home vs. away from home, as well as food groups using food shopping receipt data.;The food expenditure data from two methods showed moderate agreement with a Pearson correlation of .62, Kappa coefficient of .48, and Bland-Altman agreement of... |
