Table 2.

Summary of the responses to the questionnaire survey in Suzhou city.

Sex	Male	Female
	58.5%	41.5%
Age *	Age < 30	30 ≤ Age < 40	40 ≤ Age < 50	50 ≤ Age
	44.1%	27.1%	13.1%	15.7%
Staple Food *	Rice	Wheat	Both	Other
	38.6%	11.4%	50.0%	0.0%
Source *	Supermarket	Market	Home	Canteen	Other
	52.1% **	41.5% **	4.7% **	28.0% **	2.1% **

* Data of both male and female responses combined; ** Multiple choices were allowed.