A gene-environment interaction in the development of conduct disorder was shown in a study by Caspi et al.(2002)in whichpercent of individuals who were severely maltreated in childhood and had low MAOA activity had CD,compared topercent of individuals maltreated in childhood who had high MAOA activity.

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The study by Caspi et al. (2002) found that individuals with low MAOA activity who were severely maltreated in childhood had a higher percentage of conduct disorder (80%) compared to those with high MAOA activity (40%).

A Gene-Environment Interaction in the Development of Conduct Disorder Was