School of Health and Society, Kristianstad University, Kristianstad, Sweden Department of Health Sciences, Lund University, Lund, Sweden.
J Parkinsons Dis. 2011;1(2):185-96. doi: 10.3233/JPD-2011-11026.
The 12-item Short-Form Health Survey (SF-12) is an abbreviated version of the SF-36, one of the most widely used patient-reported health outcome rating scales. Similar to the SF-36, it yields summary scores of physical and mental health (PCS and MCS, respectively). However, SF-36 derived PCS and MCS scores have not been found valid in neurological disorders such as Parkinson's disease (PD). Here we used modern psychometric methodology (Rasch analysis) to test the SF-12 in PD, and explored the appropriateness of a total SF-12 score representing overall health. SF-12 data from 150 non-demented people with PD (56% men; mean age/PD-duration, 70/5 years) were analyzed regarding Rasch model fit for the PCS, MCS, as well as for the full SF-12. Data showed some signs of misfit to the Rasch model for all three scales (overall item-trait interaction, P ≥ 0.003; reliability, ≥ 0.85). For example, all scales exhibited signs of dependency between item responses, and the PCS measured with relatively low precision. Model fit (but not measurement precision) was improved following deletion of one PCS and one MCS item (overall item-trait interaction, P ≥ 0.387; reliability, ≥ 0.82). These observations suggest that the SF-12 can be used as a coarse health survey tool in PD and that a total SF-12 may be useful as a measure of overall health. However, its appropriateness as an outcome measure can be questioned and it is somewhat unclear exactly what the derived scores represent. As such, the SF-12 should probably be considered an assessment tool (or index) rather than a measurement instrument.
12 项简明健康量表（SF-12）是 SF-36 的简化版，SF-36 是最广泛使用的患者报告健康结果评分量表之一。与 SF-36 相似，它产生身体和心理健康的综合评分（分别为 PCS 和 MCS）。然而，SF-36 衍生的 PCS 和 MCS 评分在帕金森病（PD）等神经疾病中并不有效。在这里，我们使用现代心理测量方法（Rasch 分析）在 PD 中测试 SF-12，并探索代表整体健康的总 SF-12 评分的适当性。对 150 名非痴呆 PD 患者（56%为男性；平均年龄/PD 病程为 70/5 年）的 SF-12 数据进行了分析，以评估 PCS、MCS 以及全 SF-12 的 Rasch 模型拟合情况。数据显示，所有三个量表的模型拟合都存在一些问题（整体项目特质相互作用，P≥0.003；可靠性，≥0.85）。例如，所有量表都显示出项目反应之间存在依赖性的迹象，并且 PCS 的测量精度相对较低。删除一个 PCS 和一个 MCS 项目后，模型拟合（但不是测量精度）得到改善（整体项目特质相互作用，P≥0.387；可靠性，≥0.82）。这些观察结果表明，SF-12 可作为 PD 的粗略健康调查工具使用，并且总 SF-12 可能作为整体健康的衡量标准有用。然而，其作为结果测量的适当性值得怀疑，并且衍生分数的确切含义尚不清楚。因此，SF-12 可能应该被视为一种评估工具（或指标），而不是一种测量仪器。
