Sluggish Cognitive Tempo (SCT) has been less frequently studied in adolescents compared with school-aged youth, few studies have examined youth self-report of SCT, and no study has examined SCT in Italy. The present study examined the reliability and validity of the Child Concentration Inventory–Version 2 (CCI-2), a youth self-report measure of SCT, in 452 Italian adolescent high school students (37.8% female; mean age = 15.92 years). Adolescents were administered Italian translations of the CCI-2 and the attention deficit hyperactivity disorder (ADHD) Self-Report Scale (ASRS). School performance variables (i.e., teacher-rated grades and teachers’ disciplinary ratings) were also collected. A random subsample (n = 88) of participants was also administered the Mackworth Clock Test, a short version of the Attention Network Test, and the Stop-Signal Task. In our study, all CCI-2 items showed adequate convergent–discriminant validity, and the CCI-2 scale score showed adequate internal consistency reliability. Confirmatory factor analysis results suggested the adequacy of a one-factor model of the CCI-2 items, which showed to be invariant across sex. Confirmatory factor analyses supported the dissociability of SCT from ADHD-Inattention and ADHD-Impulsivity. SCT was significantly and negatively associated with adolescents’ average school grades, whereas ADHD was also significantly and negatively associated with adolescents’ disciplinary ratings. In the random subsample, the CCI-2 total score was positively, significantly, and uniquely associated with overall reaction time on the Attention Network Task, but not other neurocognitive variables. This study provides further support for the reliability and validity of self-reported SCT in adolescence.

与学龄青年相比，对青少年认知节奏迟缓 (SCT) 的研究较少，很少有研究检查 SCT 的青少年自我报告，也没有研究检查过意大利的 SCT。本研究在 452 名意大利青少年高中生（37.8% 的女性；平均年龄 = 15.92 岁）中检验了儿童集中量表 - 第 2 版 (CCI-2) 的可靠性和有效性，这是一项 SCT 的青少年自我报告测量。青少年接受了 CCI-2 和注意力缺陷多动障碍 (ADHD) 自我报告量表 (ASRS) 的意大利语翻译。学校表现变量（即教师评分和教师纪律评分）也被收集。一个随机子样本（n= 88) 的参与者还接受了 Mackworth 时钟测试、注意力网络测试的简短版本和停止信号任务。在我们的研究中，所有 CCI-2 项目均显示出足够的收敛-判别效度，CCI-2 量表评分显示出足够的内部一致性信度。验证性因素分析结果表明 CCI-2 项目的单因素模型是充分的，该模型显示在不同性别之间是不变的。验证性因素分析支持 SCT 与 ADHD 注意力不集中和 ADHD 冲动的分离性。SCT 与青少年的平均学校成绩显着负相关，而 ADHD 也与青少年的纪律评分显着负相关。在随机子样本中，CCI-2 总分呈正、显着、并且与注意力网络任务的整体反应时间唯一相关，但与其他神经认知变量无关。本研究为青少年自我报告 SCT 的信度和效度提供了进一步的支持。