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Global Psychotrauma Screen (GPS): psychometric properties in two Internet-based studies
European Journal of Psychotraumatology ( IF 5.783 ) Pub Date : 2021-06-25 , DOI: 10.1080/20008198.2021.1881725
Paul Frewen 1 , Ian McPhail 2 , Ulrich Schnyder 3 , Misari Oe 4 , Miranda Olff 5
Affiliation  

ABSTRACT

Background: Potentially traumatic stressors can lead to various transdiagnostic outcomes beyond PTSD alone but no brief screening tools exist for measuring posttraumatic responses in a transdiagnostic manner.

Objective: Assess the psychometric characteristics of a new 22-item transdiagnostic screening measure, the Global Psychotrauma Screen (GPS).

Method: An internet survey was administered with English speaking participants recruited passively via the website of the Global Collaboration on Traumatic Stress (GC-TS) (nGC-TS = 1,268) and actively via Amazon’s MTurk (nMTurk = 1,378). Exploratory factor analysis, correlational analysis, sensitivity and specificity analysis, and comparisons in response between the two samples and between male and female respondents were conducted.

Results: Exploratory factor analysis revealed a single factor underlying symptom endorsements in both samples, suggesting that such problems may form a unitary transdiagnostic, posttraumatic outcome. Convergent validity of the GPS symptom and risk factors was established with measures of PTSD and dissociative symptoms in the MTurk sample. Gender differences were seen primarily at the item level with women more often endorsing several symptoms and specific risk factors in the MTurk sample, and the GC-TS recruited sample endorsed more symptoms and risk factors than the MTurk sample, suggesting that the GPS may be sensitive to group differences. A GPS symptom cut-off score of 8 identified optimized sensitivity and specificity relative to probable PTSD based on PCL-5 scores.

Conclusions: The current results provide preliminary support for the validity of the GPS as a screener for the concurrent measurement of several transdiagnostic outcomes of potentially traumatic stressors and the apparent unifactorial structure of such symptoms is suggestive of a single or unitary posttraumatic outcome. Future research is needed to evaluate whether similarly strong psychometric properties can be yielded in response to completion of the GPS in other languages.



中文翻译:

全球心理创伤筛查 (GPS):两项基于互联网的研究中的心理测量学特性

摘要

背景:潜在的创伤性压力源可导致仅 PTSD 以外的各种跨诊断结果,但不存在用于以跨诊断方式测量创伤后反应的简短筛选工具。

目的:评估一种新的 22 项跨诊断筛查措施,即全球心理创伤筛查(GPS) 的心理测量学特征。

方法:通过全球创伤压力协作组织 (GC-TS) ( n GC-TS = 1,268)网站被动招募英语参与者, 并通过亚马逊 MTurk ( n MTurk  = 1,378) 主动招募说英语的参与者进行互联网调查。进行了探索性因素分析、相关分析、敏感性和特异性分析,以及两个样本之间以及男性和女性受访者之间的反应比较。

结果:探索性因素分析揭示了两个样本中症状认可的单一因素,表明这些问题可能形成单一的跨诊断、创伤后结果。GPS 症状和风险因素的收敛有效性通过 MTurk 样本中的 PTSD 和分离症状的测量来确定。性别差异主要出现在项目级别,在 MTurk 样本中,女性更经常认可几种症状和特定风险因素,而 GC-TS 招募的样本比 MTurk 样本认可更多的症状和风险因素,这表明 GPS 可能是敏感的对差异进行分组。基于 PCL-5 评分,8 分的 GPS 症状截止评分确定了相对于可能的 PTSD 的优化敏感性和特异性。

结论:目前的结果为 GPS 作为同时测量潜在创伤压力源的几个跨诊断结果的筛选器的有效性提供了初步支持,并且这些症状的明显单因素结构暗示单一或单一的创伤后结果。未来的研究需要评估是否可以产生类似的强心理测量特性以响应以其他语言完成 GPS。

更新日期:2021-06-25
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