Universidade de Trás-os-Montes e Alto Douro (Portugal).
Span J Psychol. 2013;16:E10. doi: 10.1017/sjp.2013.15.
The purpose of the present study was to assess the factor structure and reliability of the Depression, Anxiety and Stress Scales (DASS-21) in a large Portuguese community sample. Participants were 1020 adults (585 women and 435 men), with a mean age of 36.74 (SD = 11.90) years. All scales revealed good reliability, with Cronbach's alpha values between .80 (anxiety) and .84 (depression). The internal consistency of the total score was .92. Confirmatory factor analysis revealed that the best-fitting model (*CFI = .940, *RMSEA = .038) consisted of a latent component of general psychological distress (or negative affectivity) plus orthogonal depression, anxiety and stress factors. The Portuguese version of the DASS-21 showed good psychometric properties (factorial validity and reliability) and thus can be used as a reliable and valid instrument for measuring depression, anxiety and stress symptoms.
本研究旨在评估大葡语社区样本中抑郁、焦虑和压力量表（DASS-21）的因素结构和信度。参与者为 1020 名成年人（585 名女性和 435 名男性），平均年龄为 36.74（SD=11.90）岁。所有量表的信度均良好，克伦巴赫的阿尔法值在.80（焦虑）到.84（抑郁）之间。总分的内部一致性为.92。验证性因子分析显示，最佳拟合模型（*CFI=.940，*RMSEA=.038）由一般心理困扰（或负性情感）的潜在成分以及正交抑郁、焦虑和压力因子组成。DASS-21 的葡萄牙语版本具有良好的心理测量学特性（因子有效性和可靠性），因此可作为测量抑郁、焦虑和压力症状的可靠和有效的工具。
