“…The group reviewed additional reports, which have not been listed in Table 1, including single-subject studies, [39][40][41][42][43][44] other relevant studies, 16,[45][46][47][48][49][50] metaanalyses, 51,52 and reviews. [53][54][55][56] Compared with early intervention models evaluated for preschool-aged children (aged 3-5 years), programs for children aged ,3 years were more likely to use developmental approaches, more intensively involve parents, and target social communication. These studies varied in sample size and severity of diagnosis, dose (level of intensity/frequency of service delivery), duration, agent (parent, therapist, or a combination), and format of delivery (parent-managed/homebased and/or center-based in a clinic or school) of the intervention.…”