Reproducibility and validity of food group intake in a short food frequency questionnaire for the middle-aged Japanese population

Table 1 Dietary survey protocol for each area and the participants’ characteristics

Area	DR							FFQ1		FFQ2		Included in final analyses^§
			Baseline	Completed	Excluded	Within criteria		n		n		Age, mean	BMI, mean (SD)
	Start year	Methods	All	All	All	Men	Women	Men	Women	Men	Women	All	Men	Women
Yamagata	2013	Note, photos	28	28	1	12	15	12	15	12	15	54.5	23.7 (2.6)	23.0 (4.3)
Tsuruoka	2013	Note, photos	32	32	0	17	15	17	15	17	15	48.5	24.8 (4.5)	22.2 (3.3)
Chiba	2013	Note, photos	28	28	0	14	14	14	14	14	13	54.1	23.6 (4.4)	21.2 (2.9)
Shizuoka-Sakuragaoka^#	2013	Note, photos	27	27	1	13	13	13	13	13	11	46.1	22.3 (1.9)	21.0 (3.1)
Shizuoka	2012	Note, photos	26	26	0	13	13	13	13	13	13	52.6	24.4 (2.5)	20.8 (2.6)
Okazaki	2013	Note, photos	39	39	1	17	21	17	21	17	20	48.8	23.1 (2.8)	21.3 (3.3)
Aichi Cancer Center	2012	Note, photos	29	29	0	15	14	15	14	15	14	51.3	23.2 (2.8)	22.7 (4.7)
Takashima	2012	Note, photos	24	23	0	12	11	12	11	12	11	48.5	22.8 (2.9)	21.9 (2.4)
Kyoto	2013	Note, photos	22	16	0	6	10	6	10	5	9	50.1	25.3 (3.1)	21.5 (3.4)
Tokushima	2012	Note, photos	29	28	2	14	12	14	12	14	12	52.9	22.6 (2.8)	22.0 (1.9)
Saga	2011	Note, photos	24	24	0	12	12	12	12	11	12	55.6	22.8 (2.5)	23.3 (4.0)
Total			308	300	5	145	150	145	150	143	145	51.4	23.4 (3.1)	21.9 (3.4)

BMI body mass index, DR four nonconsecutive 3-day weighed dietary records at intervals of 3 months (12 days), FFQ: 47-item short food frequency questionnaire, SD standard deviation
§ The age and BMI are those at baseline among participants included in the final analyses (men = 143, women = 145)
# The numbers of dropouts in the Shizuoka-Sakuragaoka area was unknown

ISSN: 1347-4715