Subtypes of behavioral problems in autistic children aged 51-75 months show variable temporal stability and inconsistent family outcomes.

This prospective cohort study investigated behavioral subtypes in a population of 275 caregivers of autistic children aged 51-75 months in Japan. The study assessed subtypes of internalizing and externalizing problems, comparing them against other subtypes including Low-symptom, Comorbid, and Peer-difficulty groups. The primary outcomes focused on participation in daily life and family outcomes, while secondary outcomes included the temporal stability of subtypes and levels of internalizing and externalizing problems.

Regarding temporal stability, membership in the High-emotional and Externalizing groups was relatively stable over time. In contrast, the Peer-difficulty group showed frequent transitions to subtypes with higher levels of internalizing or externalizing problems. Significant differences were observed across subtypes regarding participation in daily life and family outcomes; however, these patterns were inconsistent with a simple gradient of symptom levels.

Safety and tolerability data were not reported, as adverse events, serious adverse events, discontinuations, and tolerability were not assessed or recorded in this observational study. The study design precludes causal conclusions regarding the behavioral subtypes. Key limitations include the lack of reported follow-up duration and the absence of absolute numbers or p-values for the observed associations. Funding sources and conflicts of interest were not reported. Given the observational nature of the research, these findings should be interpreted with caution when considering practice relevance.