Conflicting Findings In Genetic Studies Of Adhd

Despite compelling evidence for a genetic basis to ADHD and findings of association replicated across several studies, the findings in ADHD are, to date, not definitive. If, as hypothesized, ADHD is a complex genetic disorder, with many susceptibility genes each of small effect (114-116), the pattern of results seen to date is to be expected. Other factors that might account for conflicting results include power limitations secondary to small sample size, differences between the populations of origin of the samples, differences in measuring and defining the phenotype, and clinical heterogeneity with different distributions of the subtypes between samples.

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