Variables

n

%

Age (years)

Mean ± standard deviation

36.7 ± 9.3

Minimum

18

Maximum

48

Education

1^st grade to 5^th grade

16

69.6

6^th grade to 9^th grade

5

21.7

High School

2

8.7

Monthly Income (Salary)

<1

5

21.7

1

14

60.9

2 a 3

4

17.4

Time worked (years)

<3

2

8.7

3 a 5

3

13.0

5.1 a 10

2

8.7

10.1 de 15

6

26.1

>15

10

43.5

Smoker

Yes

7

30.4

No

16

69.6

Drinker

Yes

12

52.8

No

11

47.8

Working period (hours)

6

2

8.7

8

13

56.5

10

4

17.4

12

2

8.7

Other

2

8.7