Table 1.

General characteristics of the study subjects from the 2005 Korea National Health and Nutrition Examination Study

	Male		Female		Total
	n	%	n	%	n	%
Sex
Male					3509	45.0
Female					4292	55.0
Age groups (years)
19-29	583	16.6	753	17.5	1336	17.1
30-39	811	23.1	930	21.7	1741	22.3
40-49	872	24.9	1006	23.4	1878	24.1
50-59	579	16.5	650	15.1	1229	15.8
60-69	445	12.7	525	12.2	970	12.4
70+	219	6.2	428	10.0	647	8.3
Education
College & above	526	15.3	1214	28.8	1740	22.7
High	376	10.9	476	11.3	852	11.1
Middle	1449	42.1	1594	37.8	3043	39.7
Elementary & less than	1093	31.7	935	22.2	2028	26.5
Income
1(highest)	901	26.0	1097	25.8	1998	25.9
2	890	25.7	1097	25.8	1987	25.8
3	830	24.0	1028	24.2	1858	24.1
4(lowest)	843	24.3	1028	24.2	1871	24.3
Location of residence
Rural	715	20.4	849	19.8	1564	20.1
Urban	2794	79.6	3443	80.2	6237	80.0
Marital status
Never married	746	21.3	672	15.7	1418	18.2
Married	2533	72.3	2781	64.8	5314	68.2
Others	227	6.5	836	19.5	1063	13.7
Smoking Status
Non-smoker	696	19.8	3929	91.5	4625	59.3
Ex-smoker	999	28.5	123	2.9	1122	14.4
Current smoker	1814	51.7	240	5.6	2054	26.3