Total number of items: 8
Number of groupings: 3 (harms, benefits, trust)
Items for harms:
(1) teenagers (children) receive too many vaccines
(2) if I vaccinate my teenager (child), he/she may have serious side effects
Items for benefits:
(1) vaccines are necessary to protect the health of teenagers (children)
(2) vaccines do a good job in preventing the diseases that they are intended to prevent
(3) vaccines are safe
(4) if I do not vaccinate my teenager (child) he/she may get a disease such a meningitis and cause other teenagers or adults also to get the disease
Items for trust:
(1) in general, medical professionals in charge of vaccinations have my teenager's (child's) best interest at heart
(2) I have a good relationship with my teenager's (child's) health care provider
Scoring: A 10 cm VAS scale from 0 (strongly disagree) to 10 (strongly agree)
subscore for each grouping =
= SUM(points for the items in the group) / (number of items in the group)
Interpretation:
• minimum subscore for each group: 0
• maximum subscore for each group: 10
Parents who may have low confidence in vaccines:
(1) racial or ethnic minority
(2) lower maternal education
(3) eligibility for a vaccine financial assistance program
