Table 1.

Frequency and Percentage of Students Evaluated at Baseline (2011), Stratified by Sex and Age.

Group	Male	Female	Total
Group 1 (11 and 12 years)	110 (45.8)	130 (45.6)	240 (45.7)
Group 2 (13 and 14 years)	108 (45)	136 (47.7)	244 (46.5)
Group 3 (15 and 16 years)	22 (9.2)	19 (6.7)	41 (7.8)
Total	240 (45.7)	285 (54.3)	525 (100)

Data are presented as n (%).