An additional DHQ (DHQ5) was also completed about one year after completing DHQ1 (in November 2003 (autumn)).ĭetailed descriptions of the DRs have been published elsewhere. In each season, the DHQ was completed before the start of the dietary recording period.
Here, we compared monetary cost of dietary energy estimated from weighed DRs with that estimated from a self-administered diet history questionnaire (DHQ).īetween November 2002 and September 2003, the subjects completed the DHQ (assessing diet during the preceding month) and the 4-nonconsecutive-day weighed DRs (one weekend day and three weekdays) four times (once per season) at intervals of approximately three months (DHQ1 in November 2002 (autumn), DHQ2 in February 2003 (winter), DHQ3 in May 2003 (spring) and DHQ4 in August and September 2003 (summer) and DR1 in November and December 2002 (autumn), DR2 in February 2003 (winter), DR3 in May 2003 (spring) and DR4 in August and September 2003 (summer)). Demonstration of basic information regarding the utility of monetary diet cost estimated based on food intake data will facilitate future research on the important public health topic of dietary cost, nutrient and food intake and health status. To our knowledge, however, the comparability of monetary diet cost across dietary assessment methods has not been assessed. 14, 15 In these studies, monetary diet cost was consistently estimated using food intake information from either dietary assessment methods assessing foods actually consumed (such as 24-hour dietary recall 4– 5 6 and dietary records (DRs) 6– 7 8 9 10 11) or those retrospectively assessing dietary habits (such as diet history interview 12, 13 or questionnaire 14 and food frequency questionnaires 15– 16 17), based on databases on retail food prices (with only one exception, 3 where monetary diet cost was assessed based on estimated food expenditures from recall or actual food expenditure reports). 1, 2 An increasing number of studies have investigated the monetary cost of diet in relation to diet quality 3– 4 5 6 7 8 9 10 11 12 13 14 15 16 17 and health status variables such as body mass index. The price of food is undoubtedly an important determinant of food choice. These data indicate reasonable comparability of monetary cost of dietary energy across DR and a DHQ as well as usefulness of a single administration of the DHQ for estimating monetary cost of dietary energy. Pearson correlation between the mean of DRs1-4 and DHQ1 was 0.60 for women and 0.52 for men, while intraclass correlation between DHQ1 and DHQ5 was 0.64 for women and 0.51 for men. Pearson correlation between the mean of DRs1-4 and mean of DHQs1-4 was 0.64 for women and 0.69 for men. Monetary cost of dietary energy (Japanese yen/4184 kJ) was calculated using food intake information derived from each dietary assessment method, based on retail food prices. An additional DHQ was completed at one year after completing DHQ1 (DHQ5). The DHQ (assessing diet during the preceding month) and 4-day DRs (one weekend day and three weekdays) were completed in each season over a 1-year period (DHQs1-4 and DRs1-4, respectively). The subjects were 92 Japanese women aged 31-69 years and 92 Japanese men aged 32-76 years. This study compared monetary cost of dietary energy estimated from weighed dietary records (DRs) with that estimated from a self-administered diet history questionnaire (DHQ). However, information regarding the comparability of monetary diet cost across dietary assessment methods is absolutely lacking.
Tel: +81-3-5841-7872 Fax: +81-3-5841-7873 Email: increasing number of studies have estimated monetary diet cost using various dietary assessment methods, based on databases on retail food prices, for investigating its association with dietary intake and health outcomes. *Department of Social and Preventive Epidemiology, School of Public Health, the University of Tokyo, Hongo 7-3-1, Bunkyo-ku, Tokyo 113-0033, Japan. Kentaro Murakami, 1 Satoshi Sasaki, 1,* Yoshiko Takahashi, 2 Hitomi Okubo, 3 Naoko Hirota, 4 Akiko Notsu, 5 Mitsuru Fukui, 6 Chigusa Date 7ġ1Department of Social and Preventive Epidemiology, School of Public Health, the University of Tokyo,Ģ2Department of Health and Nutrition, School of Home Economics, Wayo Women's University, Chiba, Japanģ3Department of Nutrition Sciences, Kagawa Nutrition University, Saitama, Japan.Ĥ4Department of Health and Nutritional Science, Faculty of Human Health Science, Matsumoto Universityĥ5Food Science and Nutrition Department, Tottori College, Tottori, Japan.Ħ6Department of Statistics, Osaka City University Medical School, Osaka, Japan.ħ7Department of Food Science and Nutrition, Faculty of Human Life and Environment, Nara Women's Unive
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