Early Childhood Irritability as a Predictor of Later Mood and Anxiety Disorders: A Systematic Review and Meta-Analysis

Abstract

Introduction: Chronic irritability (frequent anger, temper outbursts) in early childhood is a common clinical complaint. Whether it predicts specific later psychiatric disorders or is a non-specific risk marker remains unclear. This review quantifies the prospective association between preschool irritability and adolescent/adult mood and anxiety disorders.

Methods: We searched PubMed, PsycINFO, and Embase for longitudinal cohort studies assessing irritability (defined by standardized measures: CBCL-affective problems, Multidimensional Assessment Profile of Disruptive Behavior) at age 3–6 years with diagnostic outcomes (structured interview) at age ≥12 years. Primary outcome: major depressive disorder (MDD) and generalized anxiety disorder (GAD). Meta-analysis used random-effects.

Results: Fourteen cohorts (n=24,587 participants) were included, with follow-up duration 8–18 years. Preschool irritability significantly predicted adolescent MDD (adjusted odds ratio [aOR] 2.21, 95% CI 1.78–2.74) and GAD (aOR 1.94, 1.58–2.38). Effects persisted after adjusting for baseline anxiety, maternal depression, and socioeconomic status. Irritability also predicted oppositional defiant disorder (aOR 2.89) but not ADHD. The predictive effect was stronger for chronic irritability (persistent across multiple timepoints, aOR 3.12) than episodic (aOR 1.68). Heterogeneity was low to moderate (I²=32%).

Discussion: Early irritability is a robust, specific predictor of later internalizing disorders, particularly MDD. The dose-response with chronicity suggests a temperamental vulnerability rather than transient developmental phase. Limitations include lack of standardized irritability cutoffs and predominantly Western samples.

Conclusions: Chronic preschool irritability should prompt monitoring for mood disorder emergence. Early interventions targeting emotion regulation may modify this trajectory, though evidence is needed.