Abbreviations: N: sample size; SD: standard deviation; t1: 1 semester
after almost exclusively remote schooling (February
3rd to February 28th 2021); t2: at
the begin of the second semester of reopened schools
(14th September 2021 to 14thNovember 2021); ISI: Insomnia Severity Index, GAD-7: Generalized Anxiety
Disorder 7 scale; PHQ-9: Patient Health Questionnaire 9 scale; WHO-5:
Well-being questionnaire of the World Health Organization (WHO).
Table 3. Statistics for the comparison between t1 and t2
(matched sample analyses).