Intolerance of Uncertainty (IU) refers to a person's incapacity to withstand uncertainty in daily life. As one of the potentially transdiagnostic cognitive vulnerbilities, IU is commonly measured by the Intolerance of Uncertainty Scale (IUS). Despite being widely used in psychopathology research, IUS has demonstrated complex and inconsistent factor structure. This project aims to ascertain the factor structure of IUS using meta-analytic confirmatory factor analysis