Table 1.

General characteristics of the study population by classification variable.

Variables	Total		Male		Female		p Value 1
	n	%	n	%	n	%
Age (years)
20–29	37	6.69	16	6.64	21	6.73	NS
30–39	87	15.73	41	17.01	46	14.74
40–49	115	20.80	41	17.01	74	23.72
50–59	117	21.16	58	24.07	59	18.91
60–69	122	22.06	52	21.58	70	22.44
≥70	75	13.56	33	13.69	42	13.46
Residence 2
Urban area	317	57.32	135	56.02	182	58.33	NS
Rural area	125	22.60	57	23.65	68	21.79
Coastal area	111	20.07	49	20.33	62	19.87
Obesity 3
Underweight	10	1.81	3	1.24	7	2.24	NS
Normal	328	59.31	135	56.02	193	61.86
Obese	215	38.88	103	42.74	112	35.90
Smoking status 4
Current smoker	106	19.17	92	38.17	14	4.49	<0.001
Ex-smoker	89	16.09	85	35.27	4	1.28
Non-smoker	358	64.74	64	26.56	294	94.23
Alcohol drinking status 5
Current drinker	325	58.77	181	75.10	144	46.15	<0.001
Ex-drinker	31	5.61	25	10.37	6	1.92
Non-drinker	197	35.62	35	14.52	162	51.92
Total	553		241	43.58	312	56.42

NS: Non-Significant; ¹ p values were calculated by chi-square test; ² “Urban area” meant an administrative district such as “Dong”, “Rural area” meant an administrative district such as “Eup” or “Myeon”, and “Coastal area” meant an administrative district adjacent to the coast; ³ “Underweight” meant Body mass index (BMI) ≤ 18.5 kg/m², “Normal” meant 18.5 kg/m² < BMI ≤ 25 kg/m², and “Obese” meant BMI ≥ 25 kg/m²; ⁴ “Current” meant have smoked any cigarette over his/her lifetime and still smokes, “Ex-” meant have smoked any cigarette over his or her lifetime and does not smoke at present; ⁵ “Current” meant had more than a drink in his/her lifetime and still drinks alcohol, “Ex-” meant had more than a drink in his/her lifetime and does not drink alcohol at present.