Table 2. Application of health belief model (HBM) constructs and social norms to inform the parent survey.

Theoretical constructs	Items per construct (True/False)
Perceived Susceptibility (HBM)	- My child is not very likely to get [disease]      - A healthy 40-y-old is more likely to get the flu than my child      - Compared with other children your child’s age, your child is more likely to get [flu or meningococcal disease]
Perceived Severity (HBM)	- Flu/Whooping cough/Meningoccocal disease/HPV illness is [a] serious [illness]
Perceived Benefits (HBM)	- Giving the influenza vaccine to children will decrease their parents’ time lost from work      - Giving the influenza vaccine to children decreases their time out of school      - Children should be vaccinated against the flu/whooping cough/meningococcal disease/HPV      - By not getting the Tdap vaccine your child is putting others at risk for disease      - The MCV4 vaccine is very effective at preventing meningococcal disease      - The HPV vaccine is very effective in preventing cervical cancer
Perceived Barriers (HBM)	- Pre-teens and teens should only be immunized against serious diseases      - Your child’s immune system could be weakened by too many immunizations      - Your child could get sick from the vaccine itself
Social Norms (TRA)	- Most parents I know take their children for the flu/Tdap vaccine      - Most people important to me think I would give my child the flu/Tdap/MCV4/HPV vaccine