This work reports a preliminary validation of the Peer Conflict Scale (PCS) for Portuguese young adults (ages 18–30 years). This instrument assesses aggression considering two of its forms (overt and relational aggression) and its two functions (reactive and proactive aggression). The initially proposed 4-factor model provided the best fit for our data and was partially invariant by sex. All subscales revealed good reliability based on internal consistency and test–retest indicators. Construct validity was obtained through the investigation of sex differences that align with previous findings on aggressive behavior and in relation to emotion regulation strategies. These initial results suggest that the PCS, originally designed for adolescents, is a promising tool to assess aggression in young adults, notwithstanding the need of additional psychometric studies to further establish the quality of this instrument.

这项工作报告了对葡萄牙年轻人（18至30岁）的对等冲突量表（PCS）的初步验证。该工具评估侵略时要考虑其两种形式（公开和关系性侵略）及其两种功能（反应性和主动性侵略）。最初提出的4因子模型为我们的数据提供了最佳拟合，并且按性别部分不变。根据内部一致性和重测指标，所有分量表均显示出良好的可靠性。通过对性别差异的调查来获得建构效度，该差异与先前关于攻击性行为以及情绪调节策略的发现相吻合。这些初步结果表明，最初为青少年设计的PCS是评估年轻人的侵略性的有前途的工具，