Purpose: Comparative data of autism-sensitive standardized measures of emotion regulation and lability, describing percentage change over time for populations of young autistic children, are currently publicly unavailable. We propose publication of such data as a support for future therapeutic intervention studies. Methods: We generate and present data of the Emotion Regulation Checklist (and subscales) for a comparative array of percentage change over time (10 months) for autistic children "not" receiving psychological or behavioral therapies (N=98, ages 4-8). Results: Comparative data summaries are presented here, and the full data set is presented as "Online Resource 1." Conclusion: We propose that this autism-sensitive measure, now with autism-specific comparative data to provide a comparison group in studies of therapeutic intervention, is well placed to assess co-occurring affective, regulatory, and behavioral factors of personal development for autistic children. [This is the online first version of an article published in "Journal of Autism and Developmental Disorders."]