Results Students increased their knowledge of HIV/AIDS
(Pearson’s measure of effect size r = 0.74) and the risk of
acquiring HIV infection (r = 0.68) statistically signifi-
cantly (p = 0.001). Girls (risk estimation: r = 0.78,
knowledge: r = 0.81) improved much more than boys (risk
estimation: r = 0.57, knowledge: r = 0.62