Table 1.

Age, sex, and region distribution among 432 participants.

Regions	Age Group	Qualitative FFQ			Quantitative FFQ
		Men	Women	Overall	Men	Women	Overall
Qingdao (Urban)	<50	0	8	97	0	8	89
	50–59	12	10		9	9
	≥60	29	38		29	34
Sichuan (Rural)	<50	17	24	108	17	24	101
	50–59	18	17		18	14
	≥60	19	13		19	9
Henan (Rural)	<50	33	22	119	33	22	118
	50–59	17	19		17	18
	≥60	13	15		13	15
Zhejiang (Rural)	<50	19	16	108	19	16	108
	50–59	18	19		18	18
	≥60	20	16		20	16
Overall		215	217	432	212	203	416

FFQ: food frequency questionnaire.