Comprehensive cost analysis of First Step Next for preschoolers with disruptive behavior disorder: Using real-world intervention data to estimate costs at scale

While the long-term societal costs for youth with disruptive behavior disorders are well documented, there is a dearth of information about the comprehensive costs of implementing even the most well-regarded early intervention programs, and the costs of scaling effective interventions are even less well understood. This study estimated the costs of delivering and disseminating First Step Next (FSN), an established tier two school-based early intervention, in preschool and kindergarten settings, including the training and ongoing technical assistance that support sustained, high-quality implementation. Using the Ingredients Method, we estimated (a) the per student costs of implementation, (b) the incremental cost of offering FSN to an additional student, and (c) the cost to disseminate FSN to 40 preschool and kindergarten students, including a sensitivity analysis to examine potential areas of cost savings. The per child cost to implement the FSN intervention with 29 triads in two cohorts was $4330. The incremental cost per additional student was only $2970, highlighting efficiencies gained once intervention infrastructure had been established. The cost of disseminating the intervention to a single cohort of 40 students was $170,106, or $4253 per student. The range in sensitivity analysis was $3141-$7829 per student, with variability in personnel wages having the greatest impact on cost estimates. This research expands on existing literature by providing a more comprehensive understanding of the cost of effective disruptive behavior interventions based on real-world implementation data, using these data to estimate dissemination costs, and showing how dissemination costs are particularly sensitive to personnel wages.