3.1. Participants and Settings
MAY
Out of the 95 informed consents received before the COVID-19 pandemic, 57 healthy participants completed the study. The dropout rate among participants who began the study in March 2020, before the outbreak of the COVID-19 pandemic, was 15%. In contrast, the dropout rate was higher (47%) among those who began the study in May 2020, after the kindergartens reopened, primarily because participants did not return to the kindergartens. Participants included 5–6-year-old Caucasian children (36 boys, 21 girls). Once enrolled, the children were randomized into the PG and the CG (