BACKGROUND The Personal Outcomes Scale (POS) is used to assess quality of life (QoL) in people with intellectual disability (ID) but the results are influenced by the severity of the disability. To address this issue, we present the standardization of the Spanish adaptation of the POS. One of the limitations of the Classical Test Theory is the differential effect in some items due to the effect of an external variable. For this reason, we propose the use of multiple linear regressions. METHOD We used a sample of 529 people with ID, along with 522 professionals and 462 parents who were administered the POS in order to carry out an in-depth psychometric study. For the analysis, we used the correction strategy by multiple linear regressions to generate centiles corrected for the severity effect of ID. RESULTS Following this technique, the results show the centiles from the raw POS score corrected for the effect of the severity of ID. CONCLUSIONS This standardization technique is a feasible option to provide a QoL scale without biased results due to the severity of ID.

中文翻译：

---

消除个人结果量表严重性的影响：智障人士的线性回归。

背景 个人成果量表 (POS) 用于评估智障 (ID) 患者的生活质量 (QoL)，但结果受残疾严重程度的影响。为了解决这个问题，我们提出了西班牙语适应 POS 的标准化。经典测试理论的局限性之一是由于外部变量的影响而导致某些项目的差异化效果。出于这个原因，我们建议使用多元线性回归。方法 我们使用了 529 名 ID 人以及 522 名专业人士和 462 名接受 POS 的父母作为样本，以进行深入的心理测量研究。对于分析，我们使用多元线性回归的校正策略来生成针对 ID 严重性影响校正的百分位数。结果按照这种技术，结果显示原始 POS 分数的百分位数针对 ID 严重性的影响进行了校正。结论 这种标准化技术是提供 QoL 量表的可行选择，而不会因 ID 的严重性而产生偏倚结果。