Table 2.

General information of the subjects (n = 181)

Project		Frequency	Percentage
Sex	male	100	55.2
	female	81	44.8
Domicile	country	19	10.5
	town	162	89.5
Nation	the Han nationality	173	95.6
	other	8	4.4
Education level	illiterate	4	2.2
	primary school	52	28.7
	junior middle school	74	40.9
	senior middle school	28	15.5
	professional training	10	5.5
	regular college course	13	7.2
Marital status	married	174	96.1
	unmarried	1	0.6
	divorce	4	2.2
	bereft of one’s spouse	2	1.1
Type of health insurance	Employee health insurance	66	36.5
	Medical insurance for residents	93	51.4
	at one’s own expense	10	5.5
	other	12	6.6
Personal monthly income	< three thousand yuan	56	30.9
	three thousand yuan ~	84	46.4
	five thousand yuan ~	36	19.9
	ten thousand yuan ~	4	2.2
	twenty thousand yuan ~	1	0.6
Smoking history	No	107	59.1
	Yes	74	40.9
Alcohol consumption history	No	109	60.2
	Yes	72	39.8
Allergic history	No	157	86.7
	Yes	24	13.3
Hospital history	No	134	74.0
	Yes	47	26.0
Surgical history	No	130	71.8
	Yes	51	28.2
Merge diseases	No	97	53.6
	Yes	84	46.4