[Changes in prevalence of knowledge, attitudes and practices of sexuality in teenage students, Bogotá, 2011-2015].

Objective: To present the changes in the prevalence of knowledge, attitudes and practices in high school adolescents in sexuality after an intervention process.

Methodology: Observational descriptive study. It was administered a questionnaire to 319 adolescents, attending three public schools, for five consecutive years as they progressed in school years (seventh to eleventh).

[Identifying risk factors for pregnancy amongst Colombian adolescents from urban and rural school populations].

Objective: Assessing risk factors for pregnancy in an adolescent school population.

Methodology: A cross-sectional observational study was carried out on 7,068 adolescents whose ages ranged from 11 to 20 years who were attending 14 public schools in Bogotá and the surrounding municipalities. A self-questionnaire was administered focusing on socio-demographic, family and sentimental factors and the adolescents' knowledge, attitudes and practices regarding sexuality.