The Leuven Perceptual Organization Screening Test (L-POST) is a test for midlevel visual perceptual deficits after brain injury. Previous research demonstrated reliable test scores and valid test score interpretations. However, the test's duration (20-35 min) is too long for a screening approach for all patients in clinical practice. Our aim was to shorten L-POST to 10-15 min based on statistical criteria of the items. Data from 3,391 participants who completed L-POST were analyzed. L-POST consists of 15 subtests with five items each. Item Response Theory (IRT) was applied to guide the selection of the items. The highest correlation with full-scale subtest scores was observed when two items were selected for each subtest following an adaptive testing procedure. A pilot validation in a subsample of participants with low abilities demonstrated adaptive testing has reasonable sensitivity (80%) but limited specificity (55%) in classifying participants with impaired and unimpaired abilities. Subsequently, we reduced the number of subtests through factor analysis. We showed that the subtests using Radial Frequency Patterns as stimuli were redundant and could be combined in one subtest. We conclude that L-POST can be shortened to 26 items (7-14 min) and an adaptive item selection procedure could prove particularly useful for screening purposes. (PsycInfo Database Record (c) 2021 APA, all rights reserved).

中文翻译：

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用项目反应理论和验证性因素分析缩短鲁汶知觉组织筛选测试。

鲁汶知觉组织筛选测试 (L-POST) 是一项针对脑损伤后中级视觉知觉缺陷的测试。先前的研究证明了可靠的考试成绩和有效的考试成绩解释。然而，测试的持续时间（20-35 分钟）对于临床实践中所有患者的筛查方法来说太长了。我们的目标是根据项目的统计标准将 L-POST 缩短到 10-15 分钟。对完成 L-POST 的 3,391 名参与者的数据进行了分析。L-POST 由 15 个子测试组成，每个子测试有 5 个项目。项目反应理论（IRT）被应用于指导项目的选择。当遵循自适应测试程序为每个子测试选择两个项目时，观察到与全面子测试分数的最高相关性。在低能力参与者的子样本中进行的试点验证表明，适应性测试在对能力受损和未受损的参与者进行分类时具有合理的敏感性 (80%) 但特异性有限 (55%)。随后，我们通过因子分析减少了子测试的数量。我们表明使用径向频率模式作为刺激的子测试是多余的，可以合并为一个子测试。我们得出结论，L-POST 可以缩短为 26 个项目（7-14 分钟），并且自适应项目选择程序对于筛选目的可能特别有用。（PsycInfo 数据库记录 (c) 2021 APA，保留所有权利）。我们通过因子分析减少了子测试的数量。我们表明使用径向频率模式作为刺激的子测试是多余的，可以合并为一个子测试。我们得出结论，L-POST 可以缩短为 26 个项目（7-14 分钟），并且自适应项目选择程序对于筛选目的可能特别有用。（PsycInfo 数据库记录 (c) 2021 APA，保留所有权利）。我们通过因子分析减少了子测试的数量。我们表明使用径向频率模式作为刺激的子测试是多余的，可以合并为一个子测试。我们得出结论，L-POST 可以缩短为 26 个项目（7-14 分钟），并且自适应项目选择程序对于筛选目的可能特别有用。（PsycInfo 数据库记录 (c) 2021 APA，保留所有权利）。