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Some research has shown that creativity test scores are independent from IQ scores, whereas other research has shown a relationship between the two. To clarify the cumulative evidence in this field, a quantitative review of the relationship between creativity test scores and IQ scores was conducted. Moderating influences of IQ tests, IQ score levels, creativity tests, creativity subscales, creativity test types, gender, age, and below and above the threshold (IQ 120) were examined. Four hundred forty-seven correlation coefficients from 21 studies and 45,880 participants were retrieved. The mean correlation coefficient was small ( r = .174; 95% CI = .165 - .183), but heterogeneous; this correlation coefficient indicates that the relationship between creativity test scores and IQ scores is negligible. Age contributed to the relationship between intelligence and creativity the most; different creativity tests contributed to it secondly. This study does not support threshold theory.
Kyung Hee Kim (Tue,) studied this question.