Background/Objective: The purpose of this study was to assess psychometric properties of the Brief Symptom Inventory (BSI-18), evaluate the measurement invariance with respect to sex, age, and tumor location, and to analyze associations between social support and sociodemographic and clinical variables among individuals with resected, non-advanced cancer. Method: A confirmatory factor analysis was conducted to explore the dimensionality of the scale and test invariance across sex, age, and tumor localization in a prospective, multicenter cohort of 877 patients who completed the BSI-18 and Multidimensional Scale of Perceived Social Support (MSPSS). Results: The results show that 3-factor and 1-factor measurement models provided a good fit to the data; however, a three-factor, second-order model was deemed more appropriate and parsimonious in this population. Alpha coefficients ranged between .75 and .88. Test of measurement invariance showed strong invariance results for sex, age, and tumor location; strong invariance over time was likewise assumed. Less perceived social support appears to correlate with all BSI factors. Conclusions: The study confirmed the tridimensional structure of the BSI-18 and invariance across age, sex, and tumor localization. We recommend using this instrument to measure anxiety, depression, and somatization in epidemiological research and clinical practice.

背景/目的：这项研究的目的是评估简短症状清单（BSI-18）的心理计量学特性，评估性别，年龄和肿瘤位置的测量不变性，并分析社会支持与社会人口统计学和患有切除性，非晚期癌症的个体之间的临床变量。方法：对前瞻性，多中心队列的877例完成BSI-18和“感知社会支持量表”（MSPSS）的多中心队列进行了验证性因素分析，以探讨该量表的维度和性别，年龄和肿瘤定位的测试不变性。 ）。结果：结果表明，三因素和一因素测量模型非常适合数据；但是，在此人群中，三因素二阶模型被认为更合适且更省时。Alpha系数介于0.75和.88之间。测量不变性的测试显示出针对性别，年龄和肿瘤位置的强烈不变性结果。同样假设随着时间的推移存在强烈的不变性。较少的社会支持似乎与所有BSI因素相关。结论：该研究证实了BSI-18的三维结构以及年龄，性别和肿瘤定位的不变性。我们建议在流行病学研究和临床实践中使用此仪器来测量焦虑，抑郁和躯体化。