Little is known about the developmental course of informant discrepancies in adolescent aggressive behavior problems, though whether aggression increases or decreases over time depends on reporter. Evaluating discrepancies longitudinally can uncover patterns of agreement/disagreement between reporters across time and determine contexts that give rise to these differences. This study addresses longitudinal informant discrepancies by examining parent-report and adolescent report of adolescent aggressive behavior problems over time and further investigates possible contextual factors related to the longitudinal discrepancy. Five-waves (from age 11.5 to 15) of multi-informant data from the PROSPER project (N = 977; 52% female; 87% Caucasian) were used to test longitudinal change in informant discrepancies between mother-, father-, and adolescent-reported aggressive behavior problems. Results showed that parents reported more aggression than their adolescents at age 11.5 and that the discrepancy at first converged over time before diverging. By age 15, adolescents reported more aggression than their parents. Parental hostility, family status, and adolescent gender predicted change in informant discrepancies. Practical and developmental implications are discussed for assessing and determining accurate change in adolescent aggressive behavior problems.

尽管攻击行为是否随着时间的推移而增加或减少取决于报告者，但对于青少年攻击性行为问题的报告者差异的发展过程知之甚少。纵向评估差异可以揭示不同时间段内记者之间同意/分歧的模式，并确定引起这些差异的背景。本研究通过检查家长报告和青少年报告随时间变化的青少年攻击性行为问题来解决纵向信息提供者的差异，并进一步调查与纵向差异相关的可能的背景因素。PROSPER 项目的五波（从 11.5 岁到 15 岁）多信息提供者数据（N  = 977；52% 女性；87% 白种人）用于测试母亲、父亲和青少年之间信息提供者差异的纵向变化- 报告攻击性行为问题。结果显示，在 11.5 岁时，父母报告的攻击性比青少年更多，而且随着时间的推移，这种差异首先趋同，然后又出现分歧。到 15 岁时，青少年比他们的父母表现出更多的攻击性。父母的敌意、家庭状况和青少年性别预测了信息差异的变化。讨论了评估和确定青少年攻击性行为问题的准确变化的实际和发展意义。