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As presented at the annual meeting of the American Professional Society of ADHD and Related Disorders
 Takeaway
 
Amodification of the West Coast Summer Treatment Program (STP) appeared successful in substituting positive peer interactions -- helping, sharing, and ignoring provocation -- for  anti-social behavior such as intentional aggression. 
Key results
The modified STP appears to be effective for children with ADHD in increasing positive peer interactions and decreasing anti-social behavior such as intentional aggression.
Positive peer interactions include helping, sharing, and ignoring provocation
Preliminary analysis included the number positive peer interactions and instances of intentional aggression
A significant regression equation was found for positive peer interactions, F(1, 570)=12.43, P <0.001; with an R2 of 0.02. Positive peer interactions increased 0.15 for each day of attending the program
A significant negative regression equation was found for intentional aggression, F(1, 570)=3.82, P=0.05, with an R2 of 0.005. Intentional aggression towards peers decreased 0.009 for each day of attending the program 
Study design
The STP. It uses a summer day camp structure to develop behavioral and social skills through a token economy, social skills curriculum, and sports instruction
While the program is typically designed to run for seven to eight weeks at eight to nine hours per day, it has been modified to be effective in as little as three weeks
The authors of the study, from the University of Washington, Washington State,  presented at APSARD described a further-modified version of the STP
Thirty-one children with ADHD participated in the program during  the summers of 2014 and 2015
There was a significant number of children with autism spectrum disorder 
Why this matters  
The Summer Treatment Program is recognized as a model evidence-based practice for treating children with attention-deficit hyperactivity disorder (ADHD). For this study, the authors modified it to include children with autism spectrum disorder and accommodate local expectations for summer day camp programs. It was successful in increasing positive peer interactions and decreasing intentional aggression.