One population group that had to significantly adapt and change their behaviour during the COVID-19 pandemic is students. While previous studies have extensively investigated the impact of the pandemic on their psychological well-being and academic performance, limited attention has been given to their activity routines. In this work, we analyze students' behavioural changes by examining qualitative and quantitative differences in their daily routines between two distinct periods (2018 and 2020). Using an Experience Sampling Method (ESM) that captures multimodal self-reported data on students' activity, locations and sociality, we apply Non-Negative Matrix Factorization (NMF) to extract meaningful behavioural components, and quantified the variations in behaviour between students in 2018 and 2020. Surprisingly, despite the presence of COVID-19 restrictions, we find minimal changes in the activities performed by students, and the diversity of activities also remains largely unaffected. Leveraging the richness of the data at our disposal, we discovered that activities adaptation to the pandemic primarily occurred in the location and sociality dimensions.

翻译：在COVID-19疫情期间,学生是需要显著调整和改变其行为模式的重要群体之一。虽然已有研究广泛探讨了疫情对学生心理健康和学业表现的影响,但对其日常行为习惯的关注却相对有限。本研究通过对比分析学生在两个不同时期(2018年和2020年)的日常行为定性及定量差异,考察其行为变化。我们采用能够捕捉学生活动状态、地理位置和社交行为等多模态自报告数据的经验采样法(ESM),应用非负矩阵分解(NMF)提取有意义的行为成分,并量化2018年与2020年学生行为间的差异。出乎意料的是,尽管存在疫情限制措施,我们发现学生开展的活动类型变化极小,活动多样性也基本未受影响。基于所掌握数据的丰富性,我们进一步发现活动对疫情的适应性调整主要发生在位置和社交维度层面。