Many of 519 teens aged 15–17 years surveyed revealed a gap between what they think they know and what they really know about contraception.
Although teens seem to trust oral contraceptives for pregnancy prevention, nearly one in five surveyed thought newer hormonal methods, such as the patch or the ring, were not very effective at pregnancy prevention—or didn't know how effective they were.
More than one in four didn't know oral contraceptives offer no protection against sexually transmitted diseases. And a majority in the survey by the Henry J. Kaiser Family Foundation mistook the diaphragm and cervical cap as preventive of STD.