Final answer:
The 2007 Mathematica study on abstinence education found that comprehensive sex education was more effective than abstinence-only education in reducing teen sexual activity and preventing unintended pregnancies.
Step-by-step explanation:
The findings of the 2007 Congressionally mandated study on abstinence education, also known as the Mathematica study, indicated that abstinence-only education programs were not effective in reducing teen sexual activity or preventing unintended pregnancies. The study compared students who received abstinence-only education with students who received comprehensive sex education, which includes information on both abstinence and contraception. The results showed that students who received comprehensive sex education were more likely to delay sexual activity and use contraception when they became sexually active.