The d2 Test of Attention: Internal Consistency, Temporal Stability and Evidence of Validity

Abstract

In this research, some psychometric properties of the d2 test were analyzed for its use in Costa Rica. A total of 445 participants aged between 18 and 47 years, 58% women and 42% men, completed the d2 test; a subset of 50 participants completed the test a second time, and 40 participants answered the additional tests: Trail Making Test, Stroop Test, Digit Span, Symbol Search, Coding and Cancellation. Internal consistency, temporal stability and validity evidences based on relations to other variables and based on the internal structure were evaluated. The most reliable scores were total number of responses (TR), total number of correct characters canceled (TA), effectiveness index (TOT) and concentration index (CON), with Cronbach’s Alpha results and test-retest reliability ranged from .90 to .97. Correlations with tests that evaluate sustained and selective attention, processing speed, accuracy, and inhibitory control suggest validity evidence for the CON, TR, TA, and O (omission errors) scores. In addition, aging is especially related to the decrease in TA and CON scores. The findings regarding the factorial structure of the test are discussed. The results corroborate previous studies and indicate validity evidence for d2 test scores for evaluating Costa Rican university students and graduates.