The current systematic review and meta-analyses examined the efficacy of psychological interventions targeting behavioural inhibition and anxiety in preschool-aged children, evaluated within randomised controlled trials. Web of Science, MEDLINE, PsycINFO and CINAHL were systematically searched from inception to March 2021. Ten studies (N = 1475 children, aged 3 - 7 years) were included in the current review. Separate analyses were conducted for behavioural inhibition, anxiety symptoms, and anxiety diagnosis as reported by parents, teachers, and observer-ratings. Pooled outcomes ranged from post-intervention to 12-month follow-up due to the limited number of studies. Meta-analyses revealed that intervention did not reduce behavioural inhibition as assessed by independent observers (SMD = -0.13, 95% CI = -0.63 to.38), but did reduce behavioural inhibition as reported by parents (SMC = -0.64, 95% CI = -1.00 to -0.27) and teachers (SMD = -0.69, 95% CI = -1.02 to -0.36). Additionally, intervention appeared to reduce the risk of anxiety disorders (RR =0.75, 95% CI =0.62 to.90), and parent-report anxiety symptoms (SMC = -0.47, 95% CI = -0.83 to -0.12) in preschool-aged children. Intervention may be efficacious in reducing anxiety in preschool-aged behaviourally inhibited children. It is less clear whether intervention leads to change in BI.
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