Table_1_Evaluating the psychometric properties of the Swedish version of the Impostor Profile scale (IPP30).docx

The Impostor Profile scale (IPP30) is a recently developed tool designed to delve into the nuanced aspects of the Impostor Phenomenon (IP), a psychological phenomenon where individuals wrongly attribute their successes to external factors, discounting their own abilities and often feeling like frauds. This study aimed to assess the psychometric properties, including factor structure, internal consistency, and nomological validity, of the Swedish version of IPP30 (S-IPP30). In a sample of Swedish students (N = 1,010; 76.7% women; Mage = 25.65, SDage = 6.43), Exploratory and Confirmatory Factor Analyses were conducted to scrutinize S-IPP30’s structure. The analyses supported a bifactor model with six specific factors and one overarching factor. However, two items in the scale displayed poor alignment with their intended subscales, adversely affecting the internal consistency of the two subscales. Consequently, a rephrasing of these items was suggested. The remaining four S-IPP30 subscales exhibited good internal consistency (Cronbach’s α = 0.76–0.90, McDonald’s ω = 0.77–0.91). Convergent validity was confirmed by largely replicating correlations among various S-IPP30 facets, the unidimensional IP measure, personality variables, and self-esteem, thereby accomplishing the goal of validating S-IPP30. This proposed modification of the two items requires further validation using a new sample to ensure its appropriateness and effectiveness in measuring the intended constructs.

模仿者剖面量表（IPP30）是一种近期开发的工具，旨在深入探究模仿现象（IP）的微妙方面。模仿现象是一种心理现象，其中个体错误地将自己的成功归因于外部因素，贬低自身的才能，并常常感觉自己如同骗子。本研究旨在评估瑞典版IPP30（S-IPP30）的心理测量特性，包括因子结构、内部一致性以及规范效度。在一组瑞典学生样本中（N=1,010；女性占比76.7%；平均年龄Mage=25.65，标准差SDage=6.43），进行了探索性和验证性因子分析，以审视S-IPP30的结构。分析结果表明，该量表的结构支持一个双因子模型，包含六个特定因子和一个总体因子。然而，量表中的两项内容与预期子量表的对齐度不佳，从而对两个子量表的内部一致性产生了不利影响。因此，建议对这些项目进行重新措辞。S-IPP30的其余四个子量表表现出良好的内部一致性（Cronbach’s α=0.76–0.90，McDonald’s ω=0.77–0.91）。通过大量复制S-IPP30的各个维度、一维的IP度量、人格变量和自尊之间的相关性，证实了收敛效度，从而实现了验证S-IPP30的目标。对两项内容提出的修改建议需要使用新的样本进行进一步验证，以确保其在测量预期构念中的适当性和有效性。