Temporal trends in the prevalence of asthma and rhinoconjunctivitis in adolescents.

Objective: To analyze the temporal trend of asthma and rhinoconjunctivitis prevalences as well as their symptoms in adolescents.

Methods: Two cross-sectional studies were conducted using the same methodology and questionnaire as was used for adolescents aged 12 to 14 years in the Brazilian city of Florianopolis, SC, Southern Brazil. Based on the international protocol of the International Study of Asthma and Allergies in Childhood (ISAAC) study, adolescents were evaluated in 2001 and 3,150 in 2012.