Researchers have noted that pathological gambling and obsessive-compulsive disorder (OCD) share some similarities such as being unable to delay or withhold repetitive behaviors. Accordingly, Durdle, Gorey, and Stewart (2008) were interested in the relations among pathological gambling and OCD. In their meta-analysis, they calculated ES€™s using the formula for Cohen€™s d, subtracting the mean of the comparison group of nonpathological gambers from the mean of the pathological gambling group. They then weighted the ES€™s based on the number of study participants. The weighted ES€™s are presented here.

1. Using Cohen€™s guidelines, how would you interpret the mean effect size for the four areas?

2. Based on the 95% CI, what would we conclude regarding the statistical significance of the four mean effect sizes?

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Obsessive-compulsive comorbidity Mean ES = .07 95% CI: (-.05, .19) 95% CI: (-.03, .19) 95% CI: (-.07, .35) 95% CI: (.88, 1.14) OCD in first-degree relatives Obsessive-compulsive personality Mean ES = .08 Mean ES = .23 Mean ES disorder Obsessive-compulsive traits 1.01