Table 1.

Demographics between control group and CHD group

Variable		Control (n=260)	CHD (n=350)	Χ2	P
Age	<40	8	12	2.69	0.61
	40-50	25	40
	50-60	106	152
	60-70	90	100
	>70	31	46
Gender	M	140	185	2.31	0.89
	F	120	165
Education level	Junior high school	98	140	4.76	0.21
	Senior middle school	73	109
	University	89	101
Type of occupation	Physical	145	187	1.59	1.01
	Mental	115	163