and Hochberg, 1995). SAS 9.1 was used to calculate the FDR q values. We did not adjust for the number of phenotypes tested because there is not an ideal way to properly account for the fact that many of the traits are highly correlated. To assist in the interpretation of our results, we calculated the pairwise linkage disequilibrium [LD (D′) and r2] between all selected tagging SNPs using GOLD (Abecasis and Cookson, 2000). The teacher-generated hyperactive-impulsive T-scores and the CPT measurement, variability, were log-transformed for all analyses to achieve a more normally distributed phenotype.
