Table 2.

Information data on vaccination of the interviewed population from the ESCULAPIO project (N = 632).

	N	%
Actual knowledgea
Yes	277	43.8
No	355	56.2
Perceived knowledge
Yes	268	45.4
No	322	54.6
Main information sourceb
General practitioner	251	42.5
Pediatrician	195	33.1
Other health care workers	74	12.5
Mass media	142	24.1
Internet	104	17.6
Friends/relatives/colleagues	62	10.5
Scientific magazines	31	5.3
Ever heard criticisms on vaccines
No	95	15.1
Yes	533	84.9
Heard criticisms from social networks
No	510	80.7
Yes	122	19.3

^aestimated through an index derived from the answers to the following six items: knowledge of the difference between compulsory and recommended vaccinations; knowledge on vaccines (efficacy, safety, adverse effects, protection, in adequate doses); knowledge on diseases (effects, preventability, contagiousness, dangerousness); knowledge of the regional vaccine calendar; knowledge of the national VaccinarSì website; knowledge of the correct strategy to prevent mentioned diseases. More than half of right answers were index of good knowledge.

^bestimated on the basis of a question with multiple answers; the percentage frequency is calculated on the 590 persons that answered the question.