Table 2.

Differences among the percentages of correct answers pre- and post- intervention to three questions in the three different groups.

	Material	Pre questionnaire (%)	Post questionnaire (%)	Difference (%)	p value*
Genital warts are caused by HPV	Article	12%	82%	+70%	p < 0.001
	Leaflet	20%	24%	+4%	P = 0.12
	Video	14%	65%	+51%	p < 0.001
Experimentations gave satisfactory results	Article	15%	77%	+62%	p < 0.001
	Leaflet	16%	19%	+3%	p = 0.25
	Video	25%	31%	+6%	p = 0.03
The vaccine can cause severe side effects	Article	7%	71%	+64%	<0.001
	Leaflet	20%	74%	+53%	<0.001
	Video	15%	30%	+15%	<0.001

*McNemar test