Table 4.

The numbers of active PTB cases from 2012 ~ 2015 separated according age, length of employment, and working area

	Number of active TB	Percentage of active TB(%)
Age (years)
20–25	2	10.5
26–30	3	15.7
31–35	1	5.3
36–40	4	21.1
41–45	4	21.1
46–50	2	10.5
51–55	2	10.5
56–60	1	5.3
> 61	0	0
Length of employment (years)
0–5	2	10.5
6–10	5	26.3
11–15	5	26.3
16–20	2	10.5
> 21	5	26.4
Work areas
high-risk areas	15	78.9
intermediate-risk areas	1	5.3
low--risk areas	3	15.8