School opening in Norway during the COVID-19 pandemic

INTERVENTION: ARM 1‐schools: Will remain closed for 5‐10 level pupils. ARM‐2‐schools: Will open for 5‐10 level pupils. The study period will last 4 weeks. The primary outcome measure will include data from 2 weeks after the commencement of the trial, and until 4 weeks after the trial period. We plan to randomise through a simple transparent process, e.g. a televised draw. We will do this by stratified randomisation, with separate draws of schools for each municipality. Hence, half of the schools in each municipality will be allocated to opening for all grades (1–10), and the other half to remaining closed for 5–10 grade (partial closure). CONDITION: COVID‐19 (SARS‐CoV‐2 infection) transmission in schools ; Infections and Infestations PRIMARY OUTCOME: Positive COVID‐19 among tested adults (aged 25–65) who live in the same household as children born 2004–2009 measured at 6 weeks, i.e. from 2 weeks after commencement of the trial, and 4 weeks after the intervention period SECONDARY OUTCOME: ; 1. Positive COVID‐19 among tested grandparents and great grandparents of children born 2004–2009 measured at 6 weeks, i.e. from 2 weeks after commencement of the trial, and 4 weeks after the intervention period; 2. Severe COVID‐19 (hospitalisation or death), among all grandparents and great grandparents of children born 2004–2009 measured at 6 weeks, i.e. from 2 weeks after commencement of the trial, and 4 weeks after the intervention period; 3. Psychological and behavior outcomes based on a short questionnaire measured at; 4. Movements and activity based on anonymised teledata measured after 4 weeks; 5. Social‐distancing (contacts) from the infection‐tracing “Smitteappâ€? measured during the 4‐week trial period; 6. Scores in 8 and 9 grade national tests (nasjonale prøver), in the autumn of 2020, and grade point average for 10 grade, June 2020 and June 2021 measured in June 2020 and June 2021; 7. Hours worked among adult household members of persons born 2004–2009 during the intervention period measured during the 4‐week intervention period; INCLUSION CRITERIA: All primary schools in Norway