Table 2 Participant demographics

Age, years

17.15 ± 3.28

16.84 ± 3.17

0.595

Grade

0.366

 First grade of high school

15.54 ± 1.08

15.01 ± 0.96

 Second grade of high school

16.89 ± 0.89

16.25 ± 1.14

 Third grade of high school

17.26 ± 1.78

17.47 ± 1.33

 Fourth grade of high school

18.91 ± 1.38

18.63 ± 1.27

Socio-economic status

0.771

 Low, n (%)

11 (45.8)

12 (46.2)

 Medium, n (%)

10 (41.7)

6 (23.1)

 High, n (%)

3 (12.5)

7 (30.7)