Validity Evidence of the Spanish Version of the Mindful Attention Awareness Scale Using the Rasch Measurement Model.

The Mindful Attention Awareness Scale (MAAS) is the most cited instrument to measure dispositional mindfulness. However, some aspects of its validity are still under debate. We aimed to assess different sources of validity evidence (i.e., response processes, content, internal structure, reliability, and relations with external variables) of the MAAS scores in a sample of Spanish-speaking participants (N = 812) applying Rasch modeling. The items formed an essentially unidimensional structure, the item hierarchy was similar to that of previous comparable studies, the items were well targeted, and the ordering of persons along the construct was adequate. Moreover, measures were invariant across four age groups and three groups based on meditation practice, and correlated as expected with a variety of well-being variables. In sum, our findings supported the interpretation of MAAS scores as a measure of mindfulness in our sample of Spanish-speaking participants. Any other specific inference should be tested.