Sexual behaviour and risk factors for the acquisition of human papillomavirus infections in young people in Italy: suggestions for future vaccination policies.

This revealed a highly significant difference (p < 0.001), indicating that, among the subjects who declared sexual activity, younger subjects debuted earlier than their older counterparts.

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With regard to the use of a contraceptive method during the last year by gender and age-group, an increasing trend (p < 0.05) was observed by age for males (Table 3 ).

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