Table 1.

Main characteristics used for the train (Veneto) and test (Sicilia) data sets.

Characteristic	Train	Test
Database	Pedianet	Pedianet
Language	Italian	Italian
Italian Region	Veneto	Sicilia
Date span	January 2, 2004-December 31, 2014	January 7, 2004-December 30, 2014
Records, n	1,230,355	569,926
Children, n	7631	2347
Pediatricians, n	46	13
Positive cases, n (%)	3481 (45.6%)	128 (5.4%)