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Purpose. To evaluate the global research on school-based comprehensive sex education (CSE) by applying rigorous and meaningful criteria to outcomes of credible studies in order to identify evidence of real program effectiveness. Methods. We examined 120 studies of school-based sex education contained in the reviews of research sponsored by three authoritative agencies: the United Nations Educational, Scientific and Cultural Organization, the U.S. federal Teen Pregnancy Prevention Program, and the Centers for Disease Control and Prevention. Their reviews screened more than 600 hundred studies and accepted only those that reached a threshold of adequate scientific rigor. These included 60 U.S. studies and 43 non-U.S. studies of school-based CSE plus 17 U.S. studies of school-based abstinence education (AE). We evaluated these studies for evidence of effectiveness using criteria grounded in the science of prevention research: sustained positive impact (at least 12 months post-program), on a key protective indicator (abstinence, condom use— especially consistent use, pregnancy, or STDs), for the main (targeted) teenage population, and without negative/harmful program effects. Results. Worldwide, six out of 103 school-based CSE studies (U.S. and non-U.S. combined) showed main effects on a key protective indicator, sustained at least 12 months post-program, excluding programs that also had negative effects. Sixteen studies found harmful CSE impacts. Looking just at the U.S., of the 60 school-based CSE studies, three found sustained main effects on a key protective indicator (excluding programs with negative effects) and seven studies found harmful impact. For the 17 AE studies in the U.S., seven showed sustained protective main effects and one study showed harmful effects. Conclusions. Some of the strongest, most current school-based CSE studies worldwide show very little evidence of real program effectiveness. In the U.S., the evidence, though limited, appeared somewhat better for abstinence education. [ABSTRACT FROM AUTHOR]

Objectives. To examine the relationship between adolescent pregnancy–prevention and sexuality and abstinence-only education funding and adolescent birthrates over time. Also, to determine whether state ideology plays a moderating role on adolescent reproductive health, that is, whether the funding has its intended effect at reducing the number of adolescent births in conservative but not in liberal states. Methods. We modeled time-series data on federal abstinence-only and adolescent pregnancy–prevention and sexuality education block grants to US states and rates of adolescent births (1998–2016) and adjusted for state-level confounders using 2-way fixed-effects models. Results. Federal abstinence-only funding had no effect on adolescent birthrates overall but displayed a perverse effect, increasing adolescent birthrates in conservative states. Adolescent pregnancy–prevention and sexuality education funding eclipsed this effect, reducing adolescent birthrates in those states. Conclusions. The millions of dollars spent on abstinence-only education has had no effect on adolescent birthrates, although conservative states, which experience the greatest burden of adolescent births, are the most responsive to changes in sexuality education–funding streams. [ABSTRACT FROM AUTHOR]