I'm having a hard time finding a self-report measure of emotion regulation or emotional reactivity for children under the age of 13. Can someone recommend a measure of any of these two constructs that I can use? Thank you!
These references might help. The last two are on ResearchGate.
Phillips, K. F. V., & Power, M. J. (2007). A new self‐report measure of emotion regulation in adolescents: The Regulation of Emotions Questionnaire. Clinical Psychology & Psychotherapy: An International Journal of Theory & Practice, 14(2), 145-156.
Vasilev, C. A., Crowell, S. E., Beauchaine, T. P., Mead, H. K., & Gatzke‐Kopp, L. M. (2009). Correspondence between physiological and self‐report measures of emotion dysregulation: A longitudinal investigation of youth with and without psychopathology. Journal of Child Psychology and Psychiatry, 50(11), 1357-1364.
Hessler, D. M., & Fainsilber Katz, L. (2007). Children's emotion regulation: Self-report and physiological response to peer provocation. Developmental Psychology, 43(1), 27.
Rydell, A. M., Thorell, L. B., & Bohlin, G. (2007). Emotion regulation in relation to social functioning: An investigation of child self-reports. European Journal of Developmental Psychology, 4(3), 293-313.
Self-reports from children under age 13 are challenging. However you decide to measure emotion regulation, make sure to also collect social desirability data (e.g., Children's Social Desirability scale. That is a significant confound with such assessments.