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VOLUME 14, ISSUE 4 October 2026 - Evidence in Action Research Brief Evidence in Action A quarterly research brief from the Center on Trauma and Children
Training Initiation and Completion in a Cluster RCT to Reduce Child Sex Trafficking in Middle Schools
Sprang, G., Duncan, M. S., Mennicke, A., Willard, J., Ray, C., Brancato, C. J., Clear, E. R., & Coker, A. L. (2026). Training initiation and completion in a cluster randomized control trial to reduce child sex trafficking in middle schools. Journal of Human Trafficking. Advance online publication. https://doi.org/10.1080/23322705.2026.2685670
Article Summary
Overview
Middle school staff (MSS) are well positioned to notice and respond to child sex trafficking (CST), yet trials testing staff training struggle with enrollment and retention. This paper uses baseline data from an ongoing cluster randomized controlled trial (cRCT) of CSTOP Now!, a bystander-intervention training. The authors asked who starts the training, who finishes it, and what researchers can do about it.
Study Design
Fifty Kentucky counties were randomized to an intervention (seven one-hour asynchronous online modules) or an attention control (one one-hour module without the bystander component). Staff completed a 20-minute pre-survey, then had 12 weeks to finish training, with a $50 eGift card for completing both. "Champions" (staff who finished training) earned $5 per referred colleague who completed the pre-survey. Of 1,102 staff directly emailed, 300 enrolled (27%); 412 participants were analyzed overall.
Key Findings
Rates. Of 412 participants, 295 (72%) initiated training. Of 291 in completion analyses, 231 (79%) completed the trial.
Initiation predictors. Staff were more likely to start if they:
- Completed the pre-survey in the fall; May to August was far less favorable (OR 0.34).
- Worked in schools with more participating staff (OR 1.02 per additional participant).
- Scored higher on the CST Myths measure (OR 1.81), meaning they better recognized CST myths as false.
No demographic characteristic significantly predicted initiation.
Completion predictors.
- Study arm was the strongest predictor. Intervention staff had 66% lower odds of completing (OR 0.34), almost certainly because of the seven-hour requirement. Among initiators, 55 of 86 intervention and 176 of 205 control participants completed.
- Metropolitan county location nearly doubled the odds of completing the trial (OR 1.98). This finding suggest that metropolitan staff may find the issue more relevant, supporting self-regulated learning.
- Higher scores on Attitudes Toward Ability to Leave CST raised the odds (OR 1.81) of completing the intervention.
- Agreeing to the statement "I would not put a child on the spot by asking about CST" lowered the odds (OR 0.72) of completing, suggesting that a reluctance to get involved impacted study completion.
Predictors did not differ by arm.
Translational Tips
- Time recruitment to the school calendar. Launch in the fall; avoid late spring and summer.
- Recruit clusters, not individuals. Initiation rose with more colleagues enrolled. Build in co-learning and harness the synergy of the cluster.
- Use champions deliberately. Peer referral is a promising approach to increase participation but researchers should define and support the role, and test its effectiveness.
- Reduce time burden. Offer protected, paid time, streamline modules, and allow flexible pacing.
- Make relevance explicit. Connect training to staff roles, especially in rural schools.
- Prime motivation before launch. The authors propose a social norms campaign to raise awareness and a sense of relevance before study launch.
- Plan for differential completion. When arms differ in length, expect uneven attrition and use intention-to-treat analyses.
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