Table 1 Frequency distribution of demographic information

Age (years)

≤ 29

28

11.1

30–39

129

51.2

40–49

89

35.3

≥ 50

6

2.4

Job experience (years)

≤ 5

43

17.1

6–10

50

19.8

11–20

150

59.5

≥ 21

9

3.6

Educational background

High school

35

13.9

Diploma

91

36.1

Associate Degree

33

13.1

Bachelor

81

32.1

MSc and above

12

4.8

Work schedule

Three-shift

192

76.2

Day-work

60

23.8

Marital status

Single

13

5.2

Married

239

94.8