From the first sentence of the conclusion:<p>&gt; It should be noted, however, that... the mean IQ for the GAD group was elevated in comparison to the control group (a mean of ∼119 versus a mean of ∼109). Further, the IQ means for both the GAD group and the control group were significantly higher than the average IQ of the general population (∼100). Results should thus be interpreted with the consideration that the study sample is non-representative of the general population.