Mertens Vera-Christina, Moser Albine, Verbunt Jeanine, Smeets Rob, Goossens Mariëlle
Research Unit INSIDE, Institute for Health and Behaviour, University of Luxembourg, Esch-sur-Alzette, Luxembourg.
Department of Rehabilitation Medicine, School for Public Health and Primary Care, Maastricht University, Maastricht, The Netherlands.
Pain Pract. 2017 Sep;17(7):902-913. doi: 10.1111/papr.12543. Epub 2016 Dec 30.
Content validity, the proper reflection of the concept to be measured, is yet unknown for the Credibility and Expectancy Questionnaire (CEQ). It is frequently used in pain rehabilitation because treatment expectancy is influential on the outcome.
To test and improve the content validity of the CEQ in a sample of patients with chronic pain in different phases of their treatment.
A qualitative observational study design using the Three-Step Test-Interview method was used. Therein, data collection, analyses, and adaptations occur iteratively.
Seventeen patients with chronic pain in different stages of treatment participated through convenience sampling from the mother sample of a randomized controlled trial. The main study parameter is content validity, which is defined as (1) interpretations and responses of the participants and (2) the identification of response problems operationalized, and resulting in changes in the CEQ. For patients waiting for treatment, the written instruction of the CEQ allowed different interpretations. After changing the instructions, the CEQ became an easy-to-understand and content-valid questionnaire. For patients who had already undergone treatment, changes regarding time frame and recall period were necessary to overcome interpretation and response problems to the CEQ.
After small changes, the CEQ appeared to be a content-valid measurement instrument for patients waiting for treatment. However, for patients who had already undergone treatment, the content validity of the CEQ was less, and considerable changes were necessary.
可信度与期望问卷（CEQ）的内容效度，即对所测概念的恰当反映，目前尚不清楚。该问卷在疼痛康复中经常使用，因为治疗期望对治疗结果有影响。
在处于不同治疗阶段的慢性疼痛患者样本中检验并提高CEQ的内容效度。
采用三步测试访谈法的定性观察性研究设计。其中，数据收集、分析和调整反复进行。
通过方便抽样，从一项随机对照试验的母样本中选取了17名处于不同治疗阶段的慢性疼痛患者参与研究。主要研究参数是内容效度，其定义为：（1）参与者的解释和回答；（2）对所出现的回答问题进行识别并落实到行动上，从而对CEQ做出修改。对于等待治疗的患者，CEQ的书面说明会导致不同的解读。修改说明后，CEQ成为一份易于理解且内容有效的问卷。对于已经接受过治疗的患者，有必要对时间框架和回忆期进行修改，以克服对CEQ的解读和回答问题。
经过细微修改后，CEQ似乎是一份针对等待治疗患者的内容有效的测量工具。然而，对于已经接受过治疗的患者，CEQ的内容效度较低，需要进行相当大的修改。
