Table 1 Characteristics of the subjects

Age (years)

0.559*

mean

32.6 ± 9.2

33.3 ± 12.0

minimum/maximum

17 / 73

16 / 73

Gender, n (%)

<0.001^#

Male

63 (18.5)

48 (42.5)

Female

277 (81.5)

65 (57.5)

Educational attainment, n (%)

0.021^#

None

6 (1.8)

8 (7.1)

Primary school

74 (21.8)

31 (27.4)

Secondary school

184 (54.1)

54 (47.8)

Vocational school

31 (9.1)

11 (9.7)

University/college

45 (13.2)

9 (8.0)

0

51 (15.0)

95 (84.1)

1

39 (11.5)

12 (10.6)

2

37 (10.9)

1 (0.9)

3

78 (22.9)

1 (0.9)

4

56 (16.5)

1 (0.9)

5

13 (3.8)

1 (0.9)

6

23 (6.8)

0 (0.0)

7

13 (3.8)

0 (0.0)

8

16 (4.7)

2 (1.8)

9

12 (3.5)

0 (0.0)

10 times or more

2 (0.6)

0 (0.0)