The revised Green et al., Paranoid Thoughts Scale (R-GPTS): psychometric properties, severity ranges, and clinical cut-offs.
The revised Green et al., Paranoid Thoughts Scale (R-GPTS): psychometric properties, severity ranges, and clinical cut-offs.
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DOI：
10.1017/s0033291719003155
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发表时间：
2021-01
影响因子：
6.9
通讯作者：
Bird JC
中科院分区：
文献类型：
--
作者：
Freeman D;Loe BS;Kingdon D;Startup H;Molodynski A;Rosebrock L;Brown P;Sheaves B;Waite F;Bird JC
格林等人的偏执思想量表（GPTS）是十多年前开发的，包括两个16个项目的量表，评估参考想法（A部分）和迫害想法（B部分）。我们的目标是进行第一次大规模的心理测量评估。共有10 551人提供了GPTS数据。422名精神病患者和805名非临床个体完成了GPTS的A、b部分，1743名精神病患者和7581名非临床个体完成了GPTS的b部分。GPTS原有的双因素结构存在模型拟合不足的问题：A部分未形成一维量表，多个项目局部依赖。修订后的gpts （R-GPTS）包括8项参照概念和10项迫害概念分量表，具有很好的模型拟合性。新的参考量表（a = 2.09-3.67）和迫害量表（a = 2.37-4.38）中的所有项目都对偏执狂的转变有很强的辨别能力，并且在严重程度范围内具有很高的可靠性（a = 0.90）。R-GPTS评分范围为：平均（参考：0-9；迫害：0-4）；升高（参考：10-15；迫害：5-10）；中度严重（参考：16-20；迫害：11-17）；严重（参考：21-24；迫害：18-27）；而且非常严重（参考：25+；迫害：28+）。在迫害量表上，推荐的分界点是区分临床程度的受迫害妄想，分界点是11分，可能是受迫害妄想的分界点是18分。心理测量评估显示需要改善GPTS。R-GPTS是一种更精确的测量方法，具有出色的心理测量特性，被推荐用于未来的偏执研究。
The Green et al., Paranoid Thoughts Scale (GPTS) – comprising two 16-item scales assessing ideas of reference (Part A) and ideas of persecution (Part B) – was developed over a decade ago. Our aim was to conduct the first large-scale psychometric evaluation. In total, 10 551 individuals provided GPTS data. Four hundred and twenty-two patients with psychosis and 805 non-clinical individuals completed GPTS Parts A and B. An additional 1743 patients with psychosis and 7581 non-clinical individuals completed GPTS Part B. Factor analysis, item response theory, and receiver operating characteristic analyses were conducted. The original two-factor structure of the GPTS had an inadequate model fit: Part A did not form a unidimensional scale and multiple items were locally dependant. A Revised-GPTS (R-GPTS) was formed, comprising eight-item ideas of reference and 10-item ideas of persecution subscales, which had an excellent model fit. All items in the new Reference (a = 2.09–3.67) and Persecution (a = 2.37–4.38) scales were strongly discriminative of shifts in paranoia and had high reliability across the spectrum of severity (a > 0.90). The R-GPTS score ranges are: average (Reference: 0–9; Persecution: 0–4); elevated (Reference: 10–15; Persecution: 5–10); moderately severe (Reference: 16–20; Persecution:11–17); severe (Reference: 21–24; Persecution: 18–27); and very severe (Reference: 25+; Persecution: 28+). Recommended cut-offs on the persecution scale are 11 to discriminate clinical levels of persecutory ideation and 18 for a likely persecutory delusion. The psychometric evaluation indicated a need to improve the GPTS. The R-GPTS is a more precise measure, has excellent psychometric properties, and is recommended for future studies of paranoia.