NEW UPDATE: Completed trials may now upload and register supplementary documents (e.g. null results reports, populated pre-analysis plans, or post-trial results reports) in the Post Trial section under Reports, Papers, & Other Materials.
Impact Evaluation of the Reducing the Risk Program
Initial registration date
February 21, 2014
May 08, 2018 4:27 PM EDT
Mathematica Policy Research
Other Primary Investigator(s)
Mathematica Policy Research
Additional Trial Information
The purpose of this study is to evaluate the effectiveness of an adapted (eight-hour) version of Reducing the Risk implemented in a set of rural Kentucky high schools. We examine impacts on knowledge of contraception and STIs, attitudes toward abstinence and condom use, intentions to have sex, and sexual risk behaviors one and two years after receiving the program.
Eight hour version of Reducing the Risk: Building Skills to Prevent Pregnancy, STDs & HIV. This program was developed over 20 years ago by ETR Associates to influence adolescent sexual and drug behaviors
Intervention Start Date
Intervention End Date
Primary Outcomes (end points)
Sexual intercourse in past three months [ Time Frame: 2-year post intervention ]
Sexual intercourse without a condom in past three months [ Time Frame: 2-year post intervention ] Contraceptive use [ Time Frame: 1-year post intervention ] Contraceptive use [ Time Frame: 2-years post intervention ]
Primary Outcomes (explanation)
Secondary Outcomes (end points)
Knowledge of contraception and STIs [ Time Frame: 1-year post intervention ]
Knowledge of contraception and STIs [ Time Frame: 2-year post intervention ] Support for abstinence [Time Frame: 1-year post intervention ] Support for abstinence [Time Frame: 2-year post intervention ] Support for condom use [Time Frame: 1-year post intervention ] Support for condom use [Time Frame: 2-year post intervention ]
Secondary Outcomes (explanation)
The evaluation’s primary objective is to test the effectiveness of an eight-hour version of Reducing the Risk on outcomes such as sexual initiation, condom and contraceptive use, number of sexual partners, and pregnancy. The evaluation will enroll youth in health classes in high schools in the Barren River and the Lincoln Trail regions of rural Kentucky. The 13 evaluation study schools will be randomly assigned twice – in summer 2013 and again in summer 2014. The study power therefore assumes a total of 26 randomly assigned clusters. Two evaluation cohorts of youth will be enrolled – the first in fall 2013 and the second in fall 2014. This study is being conducted as part of the national Personal Responsibility Education Program evaluation funded by Administration for Children and Families within the U.S. Department of Health and Human Services.
Experimental Design Details
randomization done in office by a computer
Was the treatment clustered?
Sample size: planned number of clusters
Sample size: planned number of observations
Sample size (or number of clusters) by treatment arms
estimated 13 schools treatment, 13 schools control
Minimum detectable effect size for main outcomes (accounting for sample design and clustering)
INSTITUTIONAL REVIEW BOARDS (IRBs)
IRB Approval Date
IRB Approval Number
Post Trial Information
Is the intervention completed?
Intervention Completion Date
May 15, 2015, 12:00 AM +00:00
Is data collection complete?
Data Collection Completion Date
May 25, 2017, 12:00 AM +00:00
Final Sample Size: Number of Clusters (Unit of Randomization)
26 clusters (13 schools randomized twice, once for each year of the study)
Was attrition correlated with treatment status?
Final Sample Size: Total Number of Observations
1,850 respondents to the final follow-up survey
Final Sample Size (or Number of Clusters) by Treatment Arms
The 26 clusters were evenly split between treatment and control (13 of each)
Reports, Papers & Other Materials
REPORTS & OTHER MATERIALS
The adapted version of Reducing the Risk led to a sustained increase in studentsâ€™ knowledge of contraception and sexually transmitted infections after two years, and a longer-term impact on sexual risk behavior had emerged for one subgroup of students.
Goesling, Brian, Joanne Lee, Robert G. Wood, and Susan Zief. "Adapting an Evidence-Based Curriculum in a Rural Setting: The Longer-Term Impacts of Reducing the Risk in Kentucky," Mar 31, 2018.
OPRE Report #2018-27