Research suggests that the metacognitive model is applicable to clinical child populations. However, few measures related to the model are available for younger age groups. A key concept of the model is the cognitive attentional syndrome (CAS), which encompasses the individual’s worry and rumination, maladaptive coping strategies, and metacognitive beliefs. While the CAS has been successfully measured in adults, this has not yet been attempted in children.

The aim of this study was to adapt a measure of the CAS for use with children and investigate the measure’s associations with anxiety, worry, depression and metacognitions.

Our study included 127 children with anxiety disorders aged 7–13 years. The adult measure of CAS was adapted for use with children and administered at pre- and post-treatment. We examined the correlations between variables and the ability of the CAS measure to explain variance in anxious symptomatology, as well as the measure’s sensitivity to treatment change.

The adapted measure, CAS-1C, displayed strong associations with overall anxiety, depression, worry and metacognitions. The CAS-1C explained an additional small amount of variance in anxiety and worry symptoms after accounting for metacognitions, which may be due to the measure also assessing thinking styles and coping strategies. Furthermore, the measure displayed sensitivity to treatment change.

The child measure of the CAS is a brief tool for collecting information on metacognitive beliefs and strategies that maintain psychopathology according to the metacognitive model, and it can be used to monitor treatment changes in these components.