Finally, level of education of the parents (as a measure of socio-economic status, a risk factor reported in OCD) was not found to be associated with OC symptoms in this study, although the parents of the twins who were concordant low on OC symptoms tended to have a higher level of education than the other groups, a difference that may have failed to reach significance due to the small sample size.
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Environmental factors in obsessive-compulsive behavior: evidence from discordant and concordant monozygotic twins.
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