From the complete MSTAT-II to a brief version: Psychometric properties and relationship with anxiety and depression in Peruvian population

Ambiguity tolerance is an important psychological construct, but there is no scale available in Peru. Therefore, it was decided to develop a validation of the Spanish version of the MSTAT-II in Peru. To this end, a non-probability, snowball sample of 347 participants was obtained from Lima, Peru. The results yielded unacceptable fit indices for the MSTAT-II's unifactorial model, so two additional models were created: one in which modification indices were added and another in which items were eliminated based on these factors. Both models were acceptable for internal structural validity, nomological network validity, and reliability. It is concluded that the MSTAT-II, whether with the modification indices model or the abbreviated scale, meets the criteria for structural validity, nomological network validity, and reliability.