title: Food and nutrient intakes assessed with dietary records for the validation study of a self-administered food frequency questionnaire in JPHC Study Cohort I.
abstract: We present here the survey methods and basic results of dietary records which were used as reference values in the present validation study of a self-administered food frequency questionnaire (FFQ) for the 5-year follow-up survey of the JPHC study. A semi-weighed dietary record was kept for four seven consecutive days in each of the four seasons in 3 areas, i.e., Iwate, Akita, and Nagano, and for seven consecutive days in both winter and summer in Okinawa. The mean intakes were significantly different between areas for some nutrients and food groups. A significant seasonal difference in the mean intakes was also observed in some nutrients such as carotene and vitamin C, and in some food groups such as potatoes, vegetables, and fruits in both sexes, and alcoholic beverages in men and milks in women (p<0.001).
authors.affiliation: Epidemiology and Biostatistics Division, National Cancer Center Research Institute East, Kashiwa, Chiba, Japan.
authors.forename: Satoshi
authors.initials: S
authors.lastname: Sasaki
authors.forename: Tosei
authors.initials: T
authors.lastname: Takahashi
authors.forename: Yoji
authors.initials: Y
authors.lastname: Iitoi
authors.forename: Yasuhiko
authors.initials: Y
authors.lastname: Iwase
authors.forename: Minatsu
authors.initials: M
authors.lastname: Kobayashi
authors.forename: Junko
authors.initials: J
authors.lastname: Ishihara
authors.forename: Masayuki
authors.initials: M
authors.lastname: Akabane
authors.forename: Shoichiro
authors.initials: S
authors.lastname: Tsugane
mesh_terms: D000704:Analysis of Variance; D015930:Diet Records; D004034:Diet Surveys; D002149:Energy Intake; D005247:Feeding Behavior; D005260:Female; D006801:Humans; D007564:Japan; D008297:Male; D012621:Seasons; D011795:Surveys and Questionnaires