The practicality and validity of directly elicited and SF-36 derived health state preferences in patients with low back pain
The practicality and validity of directly elicited and SF-36 derived health state preferences in patients with low back pain
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DOI：
10.1002/hec.650
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发表时间：
2002-01-01
期刊：
影响因子：
2.1
通讯作者：
Jarvik, JG
中科院分区：
文献类型：
--
作者：
Hollingworth, W;Deyo, RA;Jarvik, JG
最近的研究从SF-36中得出了偏好分数。我们比较了SF-36衍生偏好评分与直接诱导时间权衡（TTO）和视觉模拟量表（VAS）评分的实用性和结构效度。在这项观察性研究中，腰痛（LBP）患者被要求完成疾病特异性、一般性（SF-36）和健康状态偏好（VAS和TTO）测试。基线SF-36反应使用六种已发表的算法转换为偏好得分。SF-36衍生和TTO偏好值的应答率分别为379分之354（93%）和379分之303（80%）。由于难以理解缩放任务，30例患者被排除在TTO练习之外。基于选择的方法（标准赌博，TTO）比非基于选择的方法（VAS）（0.42-0.70）产生更高和更统一的偏好估计（0.77-0.79）。直接诱发的TTO值是可变的，在不同严重程度的腰痛患者之间的区分能力较弱。所有SF-36衍生的偏好都显示出一个最低阈值，这意味着对重症患者可能存在底效应。SF-36衍生的偏好在这种情况下显示出良好的实用性和结构有效性，然而不同的方法将产生不同的边际效益估计。这强调了需要一个标准化的算法来获得SF-36偏好分数。版权所有:John Wiley Sons, Ltd。
Recent research has derived preference scores from the SF-36. We compare the practicality and construct validity of SF-36 derived preference scores with directly elicited time trade off (TTO) and visual analogue scale (VAS) scores. In this observational study, low back pain (LBP), patients were asked to complete disease specific, generic (SF-36), and health state preference (VAS and TTO) instruments. Baseline SF-36 responses were converted to preference scores using six published algorithms.Response rates for the SF-36 derived and TTO preference values were 354 of 379 (93%) and 303 of 379 (80%), respectively. Thirty patients were excluded from the TTO exercise because of difficulties comprehending the scaling task. Choice based methods (standard gamble, TTO) yielded higher and more uniform estimates of preference (0.77-0.79) than non-choice based methods (VAS) (0.42-0.70). Directly elicited TTO values were variable and had less power to distinguish among patients with differing severity of LBP. All SF-36 derived preferences exhibited a minimum threshold implying a potential floor effect for severely ill patients. SF-36 derived preferences demonstrated good practicality and construct validity in this setting, however different methods-will yield disparate estimates of marginal benefit. This emphasises the need for a standardised algorithm for deriving SF-36 preference scores. Copyright (C) 2002 John Wiley Sons, Ltd.