genomic region identified in the COGA study (Dick et al., 2004). Finally, in another linkage study of conduct disorder in a sample of 616 individuals from 18 families densely segregating highly comorbid ADHD and CD were genotyped on approximately 400 markers that were 9 cM apart, on average. Linkage analysis identified regions of interest (defined as non-parametric linkage scores > 2.0) on chromosomes 4, 12, 14, and 17 (Jain et al., 2007).
