[Perception of health risks due to air pollution among adolescents in Mexico City].

Objective: Analyze the relations established between air pollution and health-disease-death in a sample of students in Mexico City.

Material And Methods: Survey of 1274 students from 14 secondary schools in five areas in Mexico City was conducted between March and April of 2003. We used a multi-stage sampling, based in a basic geostatistical areas (AGEB).

Testing a test: Analysis of the consistency of a pharmacology exam.

In higher education, learning variables are critical for professional activity and they should be properly assessed. Therefore, adequacy of evaluation instruments is very important. Consistency of an exam is one characteristic frequently studied to determine exam reliability.