Table 1.

Demographic characteristics

	Subjects, No.	%
Gender
Male	267	43.6
Female	346	56.4
Age Yr*
18-39	313	51.1
≥40	300	48.9
Districts
1	101	16.5
4	195	31.8
5	140	22.8
10	69	11.3
15	108	17.6
Smoking status
Non-smoker	498	81.2
Ex-smoker	44	7.2
Current smoker	71	11.6
Male	61	85.9
Female	10	14.1