title: Defining and measuring irritability: Construct clarification and differentiation.
abstract: Irritability is a symptom of 15 disorders in the DSM-5 and is included in Mood Disorders, Addictive Disorders, Personality Disorders, and more (American Psychiatric Association, 2013). However, the term irritability is defined and measured inconsistently in the scholarly literature. In this article, we reviewed the scholarly definitions of irritability and the item content of irritability measures. Components of definitions and items measuring irritability were divided into three categories: a) causes, b) experience, and c) consequences. We also reviewed potential causes and biomarkers of irritability. We found much overlap between definitions and measures of irritability and related constructs such as anger and aggression. Consequently, the validity of research on irritability needs to be questioned including the role of irritability in psychopathology and the presence of irritability as a symptom in any disorder. Research on irritability's role in behavioral disorders needs to be repeated after more well defined measures are developed. We proposed a more precise definition of irritability that clearly differentiates it from related constructs. Suggested items for measuring irritability are also provided.
authors.affiliation: Antioch University Seattle, 2400 3rd Avenue, Suite 200, Seattle, WA 98121, United States. Electronic address: mtoohey1@antioch.edu.
authors.forename: Michael J
authors.initials: MJ
authors.lastname: Toohey
authors.affiliation: St. John's University, 8000 Utopia Parkway, MAR 113, Queens, NY, United States; Albert Ellis Institute, 45 East 32nd Street, New York, NY 10016, United States. Electronic address: digiuser@stjohns.edu.
authors.forename: Raymond
authors.initials: R
authors.lastname: DiGiuseppe
mesh_terms: D000374:Aggression / Q000502:physiology*; D000786:Anger / Q000502:physiology*; D006801:Humans; D007508:Irritable Mood / Q000502:physiology*; D001523:Mental Disorders / Q000503:physiopathology*
keywords: Aggression; Anger; Assessment; Definition; Irritability