Revisiting an RCT study of a parent education program for Latinx parents in the United States: Are treatment effects maintained over time?

We conducted a follow-up investigation of a two-site randomized controlled trial in the United States. We examined whether the treatment effects in a culturally tailored parent education program for Latinx families of children with autism spectrum disorder were maintained over time. Using linear mixed models, we compared differences in parent and child outcomes across three timepoints: baseline, 4 months after baseline (Time 2), and 8 months after baseline (T3). Parent outcomes included family empowerment, self-reported confidence in, and frequency of using evidence-based strategies. Child outcomes included parent-reported challenging behaviors, social communication impairments, and the number of services received. Participants were 109 Latina mothers (intervention = 54, control = 55) of children with autism spectrum disorder. After intervention at both Time 2 and Time 3 in both sites, mothers in the intervention groups reported significantly greater confidence in and frequency of using evidence-based strategies, and that their child received significantly more services. We also found that there were treatment differences across the two study sites in several outcomes. The intervention for Latinx parents of children with autism spectrum disorder was efficacious and could be maintained, and that site-specific policy and service differences may need to be examined in future research to inform dissemination and implementation.