Hayes B, Solyom C A, Wing P C, Berkowitz J
Department of Psychology, University Hospital Back Pain Clinic, University of British Columbia, Vancouver.
Spine (Phila Pa 1976). 1993 Aug;18(10):1254-9. doi: 10.1097/00007632-199308000-00002.
The effect of financial compensation on responses to psychometric testing was studied in 231 chronic back pain patients. Item by item comparison of responses to two tests, readministered within 4 hours, yielded inconsistency scores. These inconsistency scores, along with scores on other psychometric measures and on Waddell's nonorganic signs test, of a group of 97 patients anticipating or receiving financial compensation (AFC), and a group of 134 patients not receiving or anticipating financial compensation (non-AFC) were compared. The AFC group had significantly higher mean scores than did the non-AFC group on the inconsistency measures, on almost all psychometric tests and on nonorganic signs. Almost all non-AFC subjects scored "0" on nonorganics, whereas 83% of AFC subjects scored "2" or higher. Prediction analysis revealed that the nonorganics score alone can predict AFC/non-AFC status; 90% of subjects were correctly classified. The inconsistency scores correctly classified 78%. Together, they correctly classified 93%. It was concluded that nonorganic scores and inconsistency scores (as defined by the investigators) distinguish between, and can predict membership in AFC and non-AFC groups. The significantly higher inconsistency scores obtained by the AFC group suggest that these psychometric test results are unreliable and hence invalid for this group.
在231名慢性背痛患者中研究了经济补偿对心理测试反应的影响。对在4小时内重新进行的两项测试的反应进行逐项比较，得出不一致分数。比较了一组97名预期或接受经济补偿（AFC）的患者和一组134名未接受或预期经济补偿（非AFC）的患者的这些不一致分数，以及其他心理测量指标和瓦德尔非器质性体征测试的分数。AFC组在不一致测量、几乎所有心理测试和非器质性体征方面的平均得分显著高于非AFC组。几乎所有非AFC受试者在非器质性体征上的得分都是“0”，而83%的AFC受试者得分“2”或更高。预测分析表明，仅非器质性体征得分就能预测AFC/非AFC状态；90%的受试者被正确分类。不一致分数正确分类率为78%。两者结合，正确分类率为93%。得出的结论是，非器质性体征分数和不一致分数（如研究者所定义）能够区分并可预测AFC组和非AFC组的成员身份。AFC组获得的显著更高的不一致分数表明，这些心理测试结果不可靠，并因此对该组无效。
