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Background The Minimising Young Children’s Anxiety through Schools (MY-CATS) trial is being conducted to determine whether an online evidence-based parent-guided Cognitive Behavioural Therapy intervention in addition to usual school practice is effective and cost-effective compared with usual school practice in reducing anxiety disorders in children aged 4-7 deemed ‘at risk’ of anxiety disorders. This update article describes the detailed statistical analysis plan for the MY-CATS trial and reports a review of the underpinning sample size assumptions. Methods and Design The MY-CATS study is a two-arm, definitive superiority pragmatic parallel group cluster randomised controlled trial in which schools will be randomised 1:1 to receive either the intervention (in addition to usual school practice) or usual school practice only. This update to the (published) protocol provides a detailed description of the study methods, the statistical principles, the trial population and the planned statistical analyses, including additional analyses comprising instrumental variable regression and mediation analysis. Trial Registration: ISRCTN 82398107. Prospectively registered on 14.1.2021. https://www.isrctn.com/ISRCTN82398107
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Jones et al. (2022) studied this question.