Table 1. Demographic characteristics of the participants (n = 911).

Characteristics	n	%
Gender (male)	447	49.1
Age
<40	291	26.6
40–50	377	41.4
>60	292	32.1
Education
Junior high school and lower	66	7.2
High school	372	40.8
College	216	23.7
University and above	251	27.6
Past history of TB	7	0.8
Past exposure to TB patients	139	15.3