The ‘Cuidate’ programme for adolescents in Spain has proven to be effective for promoting healthy sexuality (N = 626), but the mechanisms underlying its effects are unknown. This study aimed to identify mediators of the intervention’s effects compared to a control group. Participants were students from five areas of Spain, who completed baseline, immediate-posttest, 12-month and 24-month follow-up assessments. Mediation analyses revealed that ‘Cuidate’ positively affected consistent condom use indirectly through knowledge in serial with the intention to use condoms. The findings underscore the importance of targeting knowledge on HIV and sexually transmitted infections to promote condom use intention and consistent condom use.
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