Annex 1.

Patient's baseline characteristics.

	n = 145
Age – years Median (Interquartile range)	7 (2–13.5)
Female sex No. (%)	76 (52.4)
Type of condition prior to COVID 19 No. (%)
Cancer	38 (26.2)
Neurological	17 (11.7)
Gastrointestinal	15 (10.3)
Blood disorders	14 (9.7)
Cardiac	11 (7.6)
Previously healthy	10 (6.9)
Metabolic disorders	8 (5.5)
Kidney diseases	7 (4.8)
Pulmonary diseases	5 (3.4)
Genetic	5 (3.4)
Malformations	3 (2.1)
Infectious diseases	1 (0.7)
Psychiatric	1 (0.7)
Others	8 (5.5)
Days in COVID area median (interquartile range)	4 (2–8)