Group I*

Group II**

Effective

Percentage

Effective

Percentage

Age (years)

25 - 34

27

45.8

8

25.0

35 - 44

25

42.4

12

37.5

45 - 54

7

11.8

12

37.5

Total

59

100

32

100

Sex

Male

24

40.7

11

34.4

Feminine

35

59.3

21

65.6

Marital status

Married

17

28.8

14

43.8

Single

42

71.2

18

56.2

Seniority

1 - 5

14

23.7

7

21.9

6 - 10

33

55.9

13

40.6

>10

59

20.4

12

37.5

Seniority at shift work

1 - 5

19

32.2

6 - 10

35

59.3

>10

5

8.5