Unidimensionality of the Strengths and Vulnerabilities Scales in the Short-Term Assessment of Risk and Treatability (START)

IF 1.3 4区 医学 Q3 CRIMINOLOGY & PENOLOGY
R. Whittington, C. Pollak, Alice Keski-Valkama, Andrew Brown, Alina Haines-Delmont, J. Bak, J. Hvidhjelm, R. Almvik, T. Palmstierna
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引用次数: 2

Abstract

Abstract The Short-Term Assessment of Risk and Treatability (START) is a 20-item structured professional judgment instrument for assessing dynamic risk in mental health services. Much of the START research literature examines the relationship between Strengths and Vulnerabilities sub-scale total scores and various adverse outcomes including violence. This assumes that the two sub-scales have the psychometric property of unidimensionality i.e. all the items cluster together as a measure of a single construct. Such assumed unidimensionality is a necessary condition for any analyses based on scale “total score” and the widespread use of scores summated in this way in research studies may obscure more specific clusters of items within each sub-scale. This multinational study examined START assessments (n = 685) conducted in four forensic services in Scandinavia and the UK using principal component analysis. It was found that all but three Strengths items (Substance Use, Social Support and Material Resources) and all but four Vulnerabilities items (Substance Use, Social Support, Material Resources and Self care) loaded >0.5 on the expected component. This indicates a unidimensional structure underlying the START and provides empirical support from a large multinational sample for the widespread use of summated Strengths and Vulnerabilities scores in forensic psychiatric risk research.
风险和可治疗性短期评估(START)中优势和脆弱性量表的不确定性
摘要风险和可治疗性短期评估(START)是一种20项结构的专业判断工具,用于评估心理健康服务中的动态风险。START的许多研究文献考察了优势和脆弱性子量表总分与包括暴力在内的各种不良结果之间的关系。这假设两个子尺度具有单维度的心理测量特性,即所有项目都聚集在一起,作为单个结构的度量。这种假设的单维度是任何基于量表“总分”的分析的必要条件,在研究中广泛使用这种方式汇总的分数可能会模糊每个子量表中更具体的项目集群。这项多国研究考察了START评估(n = 685)在斯堪的纳维亚和英国的四个法医服务中使用主成分分析进行。研究发现,除三个优势项目(物质使用、社会支持和物质资源)外,所有优势项目和除四个弱势项目(物质用途、社会支持、物质资源和自我护理)外,预期成分的负荷均大于0.5。这表明了START背后的一维结构,并为在法医精神病风险研究中广泛使用综合优势和脆弱性评分提供了来自大型跨国样本的经验支持。
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来源期刊
CiteScore
2.80
自引率
7.10%
发文量
24
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