Table 2. Results for permutation tests for the number of CNVs genome-wide and their size vs AP.

CNV events	Mean number of CNVs – unaffected	Mean number of CNVs – affected	Empirical P-values (number of CNVs vs AP)	Average size of CNVs (kb) – Unaffected	Average size of CNVs (kb) – Affected	Empirical P-values (size of CNVs vs AP)
CNVs genome-wide (CN=0, 1, 3 and 4)	4.528	3.805	0.961	242.2	280.0	0.058
CNVs overlapping genes (CN=0, 1, 3 and 4)	2.566	1.854	0.989	266.6	388.7	0.008
CNVs outside of genes (CN=0, 1, 3 and 4)	2.094	2.000	0.638	210.7	197.2	0.738

Abbreviations: AP, Attention Problems; CN, copy number; CNV, copy number variation.