Statistical analysis
Descriptive analyses were performed for all variables. Age was
categorized in 6 age groups according to the degree of school. In Italy,
children less than three months old do not attend any type of school,
children from 3 months to 2 years old attend the day nursery school,
children from 3 to 5 years old attend kindergarten school, children
between 6 and 10 years old attend primary school, children from 11 to 13
years old attend junior secondary school and children from 14 to 19
years old attend secondary school.
To further describe the activity of the HS, descriptive statistics of
the variables were stratified by setting and chi-squared tests and
adjusted residuals (Kruskall Wallis test where appropriate) were
calculated.
Multivariable logistic regression models were carried out to understand
if children accessing the HS were more likely to be positive compared
with children accessing the other settings.
SPSS statistics (v27) was used and a two-tailed p-value < 0.05
was considered significant. Missing values were excluded.