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Abstract
Intolerance of uncertainty is the tendency of an individual to consider the possibility
of a negative event occurring unacceptable, irrespective of the probability of occurrence.
It is a key component of worry, state anxiety, and related anxiety pathologies. The
27-item Intolerance of Uncertainty Scale (IUS) was developed to measure intolerance
of uncertainty. Previous psychometric analyses of the IUS have suggested both four-
and five-factor models. High inter-item correlations, factor instability, and previous
theoretical research support the development of a reduced measure. The present study
used two undergraduate samples and evaluated a psychometrically stable 12-item two-factor
version of the IUS. The reduced measure (IUS-12) retained exemplary internal consistency,
while correlating extremely well with the original IUS and related measures of anxiety
and worry. The IUS-12 also demonstrated a stable two-factor structure, representing
both anxious and avoidance components of intolerance of uncertainty. Directions for
future research and potential applications for assessment are discussed.