Obsessive compulsive disorder (OCD) is associated with a moderate degree of underperformance on cognitive tests, including deficient processing speed. However, despite little research focusing on Intelligence Quotient (IQ) in OCD, it has long been speculated that the disorder is associated with elevated intellectual capacity. The present meta-analytic study was, therefore, conducted to quantitatively summarize the literature on IQ in OCD systematically. We identified 98 studies containing IQ data among individuals with OCD and non-psychiatric comparison groups, and computed 108 effect sizes for Verbal IQ (VIQ, n = 55), Performance IQ (PIQ, n = 13), and Full Scale IQ (FSIQ, n = 40). Across studies, small effect sizes were found for FSIQ and VIQ, and a moderate effect size for PIQ, exemplifying reduced IQ in OCD. However, mean IQ scores across OCD samples were in the normative range. Moderator analyses revealed no significant moderating effect across clinical and demographic indices. We conclude that, although lower than controls, OCD is associated with normative FSIQ and VIQ, and relatively lowered PIQ. These results are discussed in light of neuropsychological research in OCD, and particularly the putative impact of reduced processing speed in this population. Recommendations for utilization of IQ tests in OCD, and directions for future studies are offered.

中文翻译：

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强迫症中智商（IQ）的Meta分析

强迫症（OCD）与中等程度的认知测试表现不佳有关，包括处理速度不足。然而，尽管很少有针对OCD中的智商（IQ）的研究，但长期以来人们一直认为该疾病与智力能力的提高有关。因此，进行了本荟萃分析研究，以系统地定量总结有关智商在强迫症中的文献。我们确定了98个包含强迫症和非精神病对照组的个体中的智商数据的研究，并计算了108种口头智商（VIQ，n  = 55），表现智商（PIQ，n  = 13）和全面智商（FSIQ）的效应量，n = 40）。在所有研究中，发现FSIQ和VIQ的影响较小，而PIQ的影响较小，这说明OCD中的IQ降低。但是，整个OCD样本的平均智商得分在规范范围内。主持人分析显示，在临床和人口统计学指标上均无显着的调节作用。我们得出的结论是，强迫症强迫症虽然比对照组低，但与规范的FSIQ和VIQ相关，而PIQ则相对较低。根据OCD中的神经心理学研究，尤其是处理速度降低对该人群的假定影响，对这些结果进行了讨论。提供了有关在OCD中使用IQ测试的建议以及未来研究的方向。