Review of quasi-experimental studies on the efficiency of the Early Start Denver Model

<p style="text-align: justify;"><strong>Context and relevance</strong><strong>.</strong> Early intervention plays a key role in minimizing symptoms and improving adaptation in children with autism spectrum disorders (ASD). <strong>Goal</strong>. To systematize quasi-experimental studies on the effectiveness of the Early Start Denver Model (ESDM) and the P-ESDM version for parents, in order to determine their impact on the development of children with ASD and their parents. <strong>Hypothesis. </strong>The use of EDSM and P-EDSM early intervention programs, with a wide range of application intensity (from 1.5 hours to 44 hours per week), can be an effective tool for children with ASD and their parents. <strong>Methods and materials.</strong> The analysis of the results of studies on the effectiveness of ESDM and P-ESDM models published on the Scispace.com platform between 2020 and 2025 was conducted. Keywords used in the search: parent, family, early intervention, ESDM, autism spectrum disorders (ASD). According to the inclusion/exclusion criteria, 11 articles describing the results were selected from almost 200 publications. A systematic analysis method was used for the study. <strong>Results</strong>. The study showed that the use of different-intensity correction interventions using ESDM and P-ESDM programs leads to significant improvements in the development of expressive and receptive language, adaptive behavior, daily living skills, and social skills. Parents who participated in the P-ESDM program demonstrated a decrease in stress and high satisfaction with the effectiveness of the program. <strong>Conclusions.</strong> The results of the study confirm the hypothesis about the effectiveness of ESDM and P-ESDM at different levels of intensity. Systematization of data on quasi-experimental studies within the framework of the Denver model of early intervention will allow for a comparison of the results of studies conducted using other formats. It is necessary to expand access to this type of correctional assistance for families with children with ASD.</p>