Validity and Reproducibility of a Self-administered Food Frequency Questionnaire in the JPHC Study Cohort II: Study Design, Participant Profile and Results in Comparison with Cohort I

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Abstract

The objective of this study was to evaluate the validity and reproducibility of a self-administered food frequency questionnaire (FFQ) to estimate nutrient and food intake in the subjects of the Japan Public Health Center-based prospective Study on Cancer and Cardiovascular Diseases (JPHC Study Cohort II). The FFQ was originally developed to estimate intake in the JPHC Study Cohort I. A total of 392 subjects were recruited from the entire cohort participants in the 6 areas of Cohort II on a voluntary basis. The subjects completed the FFQ used for the 5-year follow-up survey twice at approximately a 1-year interval. Seven-day dietary records (DR) and blood samples were collected 4 times at 3-month intervals over a year. Daily nutrient and food intakes from FFQ and DR were estimated. The Spearman correlation coefficients for estimated intakes were calculated between FFQ and DR for validity, and between 2 identical FFQs for reproducibility. Correlation coefficients for the validity ranged from 0.09 to 0.82 among various nutrients and food groups. The correlation coefficients for most of the nutrients and food groups were improved to a level comparable to that of Cohort I by energy-adjustment. Correlation coefficients for reproducibility ranged from 0.42 to 0.82, similar to those of Cohort I.

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Dietary intakes of flavonols, flavones and isoflavones by Japanese women and the inverse correlation between quercetin intake and plasma LDL cholesterol concentration.

S. Watanabe, N Kinae, R Mochizuki … (2000)

The intake of flavonols, flavones and isoflavones by Japanese women was calculated from our food-phytochemical composition table. The relationship between intake of these phytochemicals and various anthropometric and blood chemistry data was analyzed in a cross-sectional study. The subjects were 115 women volunteers, aged 29-78 y, living in the northern part of Japan. Each subject completed a 3-d dietary record and received a health check up, including urine and blood sampling for biochemical analysis. Total mean intakes of flavonoids (sum of flavonols and flavones) and isoflavones were 16.7 and 47.2 mg/d, respectively. The major source of flavonoids was onions (45.9%) and that of isoflavones was tofu (37.0%). Total intake of isoflavones exceeded that of other dietary antioxidants, such as flavonoids, carotenoids (3.5 mg/d) and vitamin E (8.2 mg/d), and was approximately one half of the vitamin C intake (109 mg/d). The total intake of flavonoids was inversely correlated with the plasma total cholesterol concentration (TC) (r = -0.236, P: < 0.05) and plasma LDL cholesterol concentration (LDL-C) (r = -0.220, P: < 0.05), after the adjustment for age, body mass index and total energy intake. As a single component, quercetin was inversely correlated with both TC (r = -0.261, P: < 0.01) and LDL-C (r = -0. 263, P: < 0.01). Among Japanese, flavonoid and isoflavone intake is the main component among nonnutrient phytochemicals with antioxidant potential in the diet. These results suggest that a high consumption of both flavonoids and isoflavones by Japanese women may contribute to their low incidence of coronary heart disease compared with women in other countries.

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Japanese intake of flavonoids and isoflavonoids from foods.

S. Watanabe, K Shimoi, M Kimira … (1998)

The intake of flavonoids and isoflavonoids was estimated based upon a preliminary database of 40 food items, covering at least 80% of total food consumption. Fifty volunteer women in "I-City" recorded the weight of all dietary intake for 3 days in September 1996, and received a health check-up, as well as laboratory examination. The data was analyzed in relation to the various food factors. Average daily intake per capita of flavonoids was as follows: 4.9 mg kaempferol, 8.3 mg quercetin, 1.5 mg rutin, 0.6 mg myricetin, 0.3 mg luteolin, 0.01 mg myricitrin, 0.4 mg fisetin, and 0.3 mg eriodictyol. Total intake from vegetables and fruits was less than 10 mg 16.2 mg (range: 3.18-35.61 mg) and 23.27 mg (4.62-52.12 mg) of isoflavones, such as daidzein and genistein, respectively, were taken per day, and total isoflavone intake was 39.46 mg (7.80-87.73 mg). Chief component analysis on ingested vitamins, flavonoids and isoflavonoids was carried out. Factor 1 was mainly composed of flavonoids and antioxidant vitamins. Factor 1 was positively associated with age and the level of HDL cholesterol and negatively related to the level of triglycerides. Factor 2, which was mainly composed of isoflavonoids, was positively associated with creatinine and uric acid levels. So far, these factors did not show a significant association with bone density and other health indices, such as BMI and blood pressure.

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Validity of a Self-administered Food Frequency Questionnaire Used in the 5-year Follow-up Survey of the JPHC Study Cohort I: Comparison with Dietary Records for Food Groups

Satoshi Sasaki, Minatsu Kobayashi, Shoichiro Tsugane (2007)

We examined the validity of food intake measurements from a self-administered food frequency questionnaire (FFQ) used in the 5-year follow-up survey of the JPHC study using 28- or 14-day dietary records (DR) as the gold standard. The median (range) correlation coefficients between a 19-food group measured by FFQ and DR were 0.42 (0.13-0.76) for men and 0.41 (0.02-0.75) for women. The median (range) for energy-adjusted correlation coefficients was 0.38 (0.08-0.76) for men and 0.32 (0.06-0.66) for women. The mean percentage of classification into the same categories between the two methods was 30% in men and 31% in women. Only 2% in men and 3% in women of subjects were classified into the extreme opposite categories. When we adjusted for area, the median correlation coefficients were decreased in crude intakes (0.34 in men and 0.28 in women), whereas no remarkable change was observed in energy-adjusted intakes (0.33 in men and 0.29 in women). In conclusion, the results suggest that the FFQ can be used in the JPHC study cohort I to rank individuals according to the intakes for most of the food groups examined. But intake levels both at population and individual levels were difficult to estimate.

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Author and article information

Journal

Journal ID (nlm-ta): J Epidemiol

Journal ID (iso-abbrev): J Epidemiol

Journal ID (publisher-id): JE

Title: Journal of Epidemiology

Publisher: Japan Epidemiological Association

ISSN (Print): 0917-5040

ISSN (Electronic): 1349-9092

Publication date (Electronic): 30 November 2007

Publication date Collection: 2003

Volume: 13

Issue: 1 Suppl

Pages: S134-S147

Affiliations

[1 ]Cancer Information and Epidemiology Division, National Cancer Center Research Institute.

[2 ]Epidemiology and Biostatistics Division, National Cancer Center Research Institute East.

[3 ]Department of Nutrition, Tokyo University of Agriculture.

Author notes

This work was supported by grants-in-aid for cancer research and for the Second-Term Comprehensive Ten-Year Strategy for Cancer Control from the Ministry of Health, Labor and Welfare of Japan, and by grants-in aid for scientific research from the Ministry of Education, Culture, Sports, Science and Technology of Japan.

Address for correspondence: Shoichiro Tsugane, Epidemiology and Biostatistics Division, National Cancer Center Research Institute East, 6-5-1 Kashiwanoha, Kashiwa, Chiba 277-8577, Japan.

Article

Publisher ID: 13.S134

DOI: 10.2188/jea.13.1sup_134

PMC ID: 9767691

PubMed ID: 12701641

SO-VID: e1264732-0053-4ba5-a1e7-21a0937a4db6

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This is an open access article distributed under the terms of Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.

Validity and Reproducibility of a Self-administered Food Frequency Questionnaire in the JPHC Study Cohort II: Study Design, Participant Profile and Results in Comparison with Cohort I

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Most cited references 19

Dietary intakes of flavonols, flavones and isoflavones by Japanese women and the inverse correlation between quercetin intake and plasma LDL cholesterol concentration.

Japanese intake of flavonoids and isoflavonoids from foods.

Validity of a Self-administered Food Frequency Questionnaire Used in the 5-year Follow-up Survey of the JPHC Study Cohort I: Comparison with Dietary Records for Food Groups

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