Use of face masks did not impact COVID-19 incidence among 10–12-year-olds in Finland
medRxiv | 7 Apr 2022 Aapo Juutinen, Emmi Sarvikivi, Päivi Laukkanen-Nevala, Otto Helve doi: https://doi.org/10.1101/2022.04.04.22272833 In fall 2021 in Finland, the recommendation to use face masks in schools for pupils ages 12 years and above was in place nationwide. Some cities recommended face masks for younger pupils as well. Our aim was to compare COVID-19 incidence among 10–12-year-olds between cities with different recommendations…