Table 1.

Scores cognitive tests.

Test	Mean z-score (SD)
Trail making test (Strauss et al., 2006)
-A	1.13 (1.39)
-B	1.71 (2.18)
Stroop test (Golden, 1994)
-Color	−0.73 (0.94)
-Word	−1.24 (0.86)
-Color-word	−0.71 (0.99)
-Resistance interference	−0.16 (0.99)
Digit span (WMS-R; Weschler, 1974)
-Forward	1.27 (4.18)
-Backward	−1.34 (5.26)
Hayling test (Abusamra et al., 2007)
-A (time)	0.25 (1.14)
-B (time)	−0.05 (1.12)