The Narcissistic Grandiosity Scale (NGS; Rosenthal et al., 2020) is a 16-item adjective-rating scale with scores that measure narcissistic grandiosity, a central feature of the grandiose form of narcissism. The NGS was developed both to measure the narcissistic grandiosity construct and to do so in a way that maximally distinguishes narcissistic grandiosity from nongrandiose self-esteem, a construct with which narcissistic grandiosity is often conflated. Over the past few years, different shortened versions of the NGS have been recommended in the literature. To evaluate these shortened versions, we used a meta-analysis to assess how well scores on each NGS item measured narcissistic grandiosity and distinguished it from self-esteem. Using zero-order and partial correlations from 40 data sets, which included information from 14,938 individual participants, we found that all NGS items correlated moderately with grandiose narcissism and largely retained those relations when controlling for self-esteem as well as narcissistic entitlement. The results help inform researchers about the degree to which items recommended for shorter versions of the NGS meet the scale’s theoretical goals. We conclude that, when possible, it is advantageous for researchers to continue to use the full 16-item version of the scale.

中文翻译：

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自恋夸大量表：项目收敛和区分有效性的荟萃分析检查。

自恋夸大量表（NGS；Rosenthal 等人，2020 年）是一个 16 项形容词评定量表，其分数可衡量自恋夸大性，这是自恋的夸大形式的核心特征。NGS 的开发既是为了衡量自恋的夸大结构，也是为了最大限度地区分自恋的夸大与非夸大的自尊，这种结构经常与自恋的夸大相混淆。在过去几年中，文献中推荐了 NGS 的不同缩短版本。为了评估这些缩短版本，我们使用荟萃分析来评估每个 NGS 项目的分数如何衡量自恋的夸大性并将其与自尊区分开来。使用来自 40 个数据集的零阶和偏相关，其中包括来自 14 个的信息，在 938 名个体参与者中，我们发现所有 NGS 项目都与夸大自恋适度相关，并且在控制自尊和自恋权利时很大程度上保留了这些关系。结果有助于让研究人员了解为较短版本的 NGS 推荐的项目在多大程度上符合量表的理论目标。我们得出结论，在可能的情况下，研究人员继续使用完整的 16 项版本的量表是有利的。