The UCLA Loneliness Scale (ULS-20) and its short version (ULS-8) are widely used to measure loneliness. However, the question remains whether or not previous studies using the scale to measure loneliness are measuring the construct equally across countries. The present study examined the measurement invariance (MI) of both scales in Germany, Indonesia, and the United States (N = 2350). The one-, two-, and three-factor structure of the ULS-20 did not meet the model fit cut-off criteria in the total sample. The ULS-8 met the model fit cut-off criteria and has configural, but not metric invariance because two items unrelated to social isolation were not MI. The final six items (ULS-6) exclusively related to social isolation had complete MI. Participants from the United States scored highest in the ULS-6, followed by participants from Germany and then Indonesia. We conclude that the ULS-6 is an appropriate measure for cross-cultural studies on loneliness.

加州大学洛杉矶分校孤独量表（ULS-20）及其简短版（ULS-8）被广泛用于衡量孤独感。然而，问题仍然是以前使用量表来衡量孤独感的研究是否在各国平等地衡量了这一结构。本研究考察了德国、印度尼西亚和美国（N= 2350)。ULS-20 的一因子、二因子和三因子结构在总样本中不符合模型拟合截止标准。ULS-8 符合模型拟合截止标准，并且具有配置不变性，但不是度量不变性，因为与社会隔离无关的两个项目不是 MI。仅与社会隔离相关的最后六个项目 (ULS-6) 具有完全 MI。来自美国的参与者在 ULS-6 中得分最高，其次是来自德国和印度尼西亚的参与者。我们得出结论，ULS-6 是跨文化孤独研究的适当衡量标准。