Psychometric properties of the Impulsive/Premeditated Aggression Scale in Portuguese community and forensic samples

Abstract Introduction Aggression can be defined according to impulsive or premeditated features. Impulsivity is defined as an uncontrolled and unplanned form of aggression. On the contrary, premeditation requires planning and is goal-oriented. Objective The purpose of this study was to validate the basic psychometric properties of the Impulsive/Premeditated Aggression Scale (IPAS) into European Portuguese. The scale evaluates aggression according to impulsive and premeditated features, which are considered the predominant forms of aggressive behavior, and can be used in community, forensic and clinical settings. Methods Participants from a community sample (n = 957; 424 male) and incarcerated individuals (n = 115, all male) completed the IPAS. Results Internal consistency and reliability indicated that the scale has good psychometric properties in both samples. Data from a principal component analysis (PCA) demonstrated similarities to previous structures reported in the literature. Conclusions The scale demonstrated to be sensitive to the bimodal classification of aggression in community and forensic samples, indicating its utility in the characterization of aggressive patterns.摘要 引言 攻击行为可依据冲动性或预谋性特征进行界定。冲动性攻击被定义为一种不受控制、无计划性的攻击形式；与之相对，预谋性攻击需要预先筹划，且具有明确目标导向。 研究目的 本研究旨在将《冲动/预谋攻击量表》（Impulsive/Premeditated Aggression Scale, IPAS）翻译成欧洲葡萄牙语版本，并验证其基本心理测量学属性。该量表以冲动性与预谋性这两类主流攻击行为表现形式为依据开展攻击行为评估，可应用于社区、司法及临床场景。 研究方法 本研究招募社区样本参与者957名（其中男性424名）与在押人员115名（均为男性），所有参与者均完成了IPAS测评。 研究结果 内部一致性与信度分析结果表明，该量表在两类样本中均具备良好的心理测量学属性。主成分分析（principal component analysis, PCA）所得结果与此前文献报道的量表结构高度相似。 研究结论 该量表可有效区分社区与司法样本中攻击行为的双模态分类，证实其可用于攻击行为模式的特征表征。