Attention Test d2 (Brickenkamp, 2007, Adapted to Spanish by Brickenkamp and Seisdedos-Cubero, 2012)

This test was used to assess selective attention. It consists of 14 lines, each containing 47 characters (“p” and “d” with 1–4 dashes arranged either individually or in pairs above and below the character), in total there are 658 items. The subject is required to scan across the line to identify and to mark all “d” with a total of 2 dashes, either above or below the letter. To complete the test 10 min were allowed. The test can be administered individually or in group format, in the present study the latter format was chosen. The outcome measures used in this study were (TR) the total number of items processed, (TA) the total number of correct answers, (O) the number of errors of omission (d’s with two dashes that were not marked), (C) the number of errors of commission (marked d’s with less or more than 2 sashes or p’s), (TOT) total effectiveness of the test [TR- (O + C)] and (CON) concentration index (TA-C).

Grades in Spanish language were also collected to have knowledge of the student’s school performance and their general level of reading and comprehension capacities.