Recent research has yielded multivariate base rates (MBRs) of low scores in healthy populations using a widely adopted concussion screening measure, Immediate Postconcussion and Cognitive Testing (ImPACT). However, the extent to which individuals with concussion obtain reliable changes at divergent frequencies relative to healthy individuals is largely unknown. The present study examined whether MBRs of reliable change accurately discriminated between those with and without concussion. This archival review consisted of 129 healthy individuals and 81 individuals with concussion. MBRs of reliable change scores were examined at varying cutoffs and frequencies between those with and without concussion. Composites showed small to medium effect sizes in differentiating between those with and without concussion. MBRs of reliable change scores on ImPACT provided limited discriminative utility in isolation. Computations of posttest probabilities using Bayes’ Theorem yielded evidence for incremental gains when utilizing MBRs of reliable change under certain constraints.

最近的研究使用广泛采用的脑震荡筛查措施、即刻脑震荡后和认知测试 (ImPACT) 得出了健康人群中低分的多元基础率 (MBR)。然而，与健康个体相比，脑震荡个体在不同频率下获得可靠变化的程度在很大程度上是未知的。本研究检查了可靠变化的 MBR 是否能准确地区分有脑震荡和没有脑震荡的患者。该档案审查包括 129 名健康人和 81 名脑震荡患者。在有和没有脑震荡的患者之间以不同的截止值和频率检查了可靠变化分数的 MBR。复合材料在区分有脑震荡和没有脑震荡的情况下显示出小到中等的效果。ImPACT 上可靠变化分数的 MBR 单独提供了有限的判别效用。使用贝叶斯定理计算后测概率产生了在某些约束条件下利用可靠变化的 MBR 时增量增益的证据。