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

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

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