Table 1: Characteristics of the sample (n=681).

	n (%)	p-value
Sex
Male	337 (49.5)	0.789
Female	344 (50.5)
Age (years)
10-12	248 (36.4)	0.117
13-15	229 (33.6)
16-18	204 (30.0)
Parental education
Elementary	147 (21.7)	<0.001
High	422 (62.0)
College	112 (16.4)
Participation in classes
Yes	577 (84.7)	<0.001
No	104 (15.3)
Active during classes
Yes	333 (48.9)	0.565
No	348 (51.1)

p-value refers to chi-square test; n (%): absolute (relative) frequency.