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Updated: Jul 23, 2025

Universal Screening for Prevention of Reading, Writing, and Math Disabilities in Spanish
Published on: July 18, 2020
UD Interference Test: creation and validation of a new instrument of resistance to interference. Normalisation and
O Sáez-Atxukarro1, R Del Pino2, J Peña1
1Departamento de Métodos y Fundamentos de la Psicología; Universidad de Deusto, Bilbao, Spain.
Introduction:
The UD Interference Test measures processing speed and attention, and is based on the concept of interference of the Stroop Color and Word Test. The main purpose of the study is to provide an alternative version of the Stroop Color and Word Test that overcomes some of the limitations of previous versions in assessing individuals with daltonism or age-related reading difficulties, and to obtain normative and standardised data for the Spanish population.
Methods:
This study is part of the Normacog project. We evaluated 905 individuals (age range, 18-93 years) to analyse the test's reliability and concurrent and construct validity. We evaluated the effect of age, sex, and level of education on UD Interference Test performance and calculated percentiles and age- and education-adjusted scaled scores.
Results:
The test has good reliability (α = 0.875) and concurrent (r = 0.443-0.725; P < .001) and construct validity (r = 0.472-0.737; P < .001). We observed age and educational level to have a significant effect on UD Interference Test scores, explaining 12% to 40% of variance. Sex only had a significant effect on the resistance to interference index.
Conclusions:
We present an alternative version of the Stroop Color and Word Test with some advantages over previous versions. We provide standardised and normalised data for the Spanish population to correct the test according to the subject's age and level of education.
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