Table 3.

General characteristics of 2628 subjects.

Variables	N	Proportion of proportion(%)
Number	2628	100
Location
Urban	1374	52.28
Rural	1254	47.72
Gender
Male	1358	51.67
Female	1270	48.33
Age (years)
18-	635	24.16
30-	547	20.81
40-	569	21.65
50-	424	16.13
60-	263	10.00
≥70	190	7.23