A significant body of research has demonstrated that IQs obtained from different intelligence tests substantially correlate at the group level. Yet, there is minimal research investigating whether different intelligence tests yield comparable results for individuals. Examining this issue is paramount given that high-stakes decisions are based on individual test results. Consequently, we investigated whether seven current and widely used intelligence tests yielded comparable results for individuals between the ages of 4–20 years. Results mostly indicated substantial correlations between tests, although several significant mean differences at the group level were identified. Results associated with individual-level comparability indicated that the interpretation of exact IQ scores cannot be empirically supported, as the 95% confidence intervals could not be reliably replicated with different intelligence tests. Similar patterns also appeared for the individual-level comparability of nonverbal and verbal intelligence factor scores. Furthermore, the nominal level of intelligence systematically predicted IQ differences between tests, with above- and below-average IQ scores associated with larger differences as compared to average IQ scores. Analyses based on continuous data confirmed that differences appeared to increase toward the above-average IQ score range. These findings are critical as these are the ranges in which diagnostic questions most often arise in practice. Implications for test interpretation and test construction are discussed.

大量研究表明，从不同智力测试中获得的智商在群体水平上具有显着相关性。然而，很少有研究调查不同的智力测试是否会对个人产生可比较的结果. 鉴于高风险的决定是基于个人测试结果，因此检查这个问题至关重要。因此，我们调查了七种当前和广泛使用的智力测试是否对 4-20 岁之间的个体产生了可比较的结果。结果大多表明测试之间存在显着相关性，尽管在组水平上确定了几个显着的平均差异。与个体水平可比性相关的结果表明，不能凭经验支持对确切 IQ 分数的解释，因为 95% 的置信区间无法用不同的智力测试可靠地复制。非语言和语言智力因素分数的个人水平可比性也出现了类似的模式。此外，名义智力水平系统地预测了测试之间的 IQ 差异，与平均 IQ 分数相比，高于和低于平均水平的 IQ 分数与更大的差异相关。基于连续数据的分析证实，在高于平均水平的 IQ 分数范围内，差异似乎有所增加。这些发现至关重要，因为这些是实践中最常出现诊断问题的范围。讨论了对测试解释和测试构建的影响。这些发现至关重要，因为这些是实践中最常出现诊断问题的范围。讨论了对测试解释和测试构建的影响。这些发现至关重要，因为这些是实践中最常出现诊断问题的范围。讨论了对测试解释和测试构建的影响。