Sexually active adolescents and condoms: changes over one year in knowledge, attitudes and use.

Over a year when public health information regarding AIDS intensified, changes in perceptions and use of condoms in a sample of sexually active adolescents in San Francisco were examined. Although perceptions that condoms prevent sexually transmitted diseases (STDs) and the value and importance placed on avoiding STDs remained high, these were neither reflected in increased intentions to use condoms nor in increased use.