. 2008 Feb 1;8:45. doi: 10.1186/1471-2458-8-45

Table 2.

Evaluation of the safety, effectiveness and usefulness of vaccination as a function of perceived relative vulnerability and perceived control (N = 1763)

	Perceived relative vulnerability				Perceived control ¹
	All	Optimists 19.5%	Pessimists 19.7%	Realists 60.8%	Can't do anything 76.1%	Internal perceived control 8.2%	External perceived control 10.8%

Effectiveness (possibility to contract the infection after vaccination – % yes)	39	42	39	38	36^a	45^b	50^b
Safety (side-effects of vaccination – % yes)	12	13	11	11	10^a	19^b	13^a
Usefulness of vaccination
- Campaign reassuring¹	1.5	1.4	1.2^a	1.7^b	1.5^a	2.0^b	1.7
- Campaign beneficial¹	1.1	1.0	0.8^a	1.2^b	1.1^a	1.8^b	1.1^a
- Campaign self-evident¹	2.5	1.8^a	2.0^a	2.8^b	2.3^a	3.5^b	2.9

The VAS scale ranges from 1 (very reassuring/very beneficial/self-evident) to 10 (not reassuring/not beneficial/not self-evident). All variables in a row with different superscripts differ at p < .001

¹The percentages do not add up to 100%: 5% of the parents reported other reasons, these are excluded.