Table 1 Overview of psychosocial, attitudinal and organizational factors measured with the questionnaires
Factors | Example question Totally disagree–totally agree (scale 1–5) | Items | Alpha/Pearson |
|---|---|---|---|
Psychosocial factors | |||
Attitude | To vaccinate against meningococcal disease, I think is (Very unimportant–very important) | Adolescents: 3 Parents: 3 | α = 0.926 α = 0.965 |
Social norm | Friends recommend vaccinating against meningococcal disease | Adolescents: 5 Parents: 7 | α = 0.789 α = 0.852 |
Knowledge | Meningococcal disease is caused by a bacteria (True/False) | 5 items | N/A |
Perceived capacity | We had enough information to make an informed decision about the MenACWY vaccination | 1 item | N/A |
Perceived autonomy | It is our own choice to receive a vaccination | 1 item | N/A |
Decisional uncertainty | The decision to accept the MenACWY vaccination feels good | Adolescents: 2 Parents: 2 | r = 0.401a r = 0.698 |
Anticipated negative affect | I would be concerned if I did not accept the MenACWY vaccination | Adolescents: 3 Parents: 3 | α = 0.827 α = 0.886 |
Attitudinal factors | |||
General beliefs | Accepting a vaccination is self-evident | Adolescents: 8 Parents: 8 | α = 0.748 α = 0.873 |
Moral norm (for oneself) | I feel obliged to vaccinate against meningococcal disease | 1 item | N/A |
Moral norm (for others) | If I would get vaccinated against meningococcal disease, I would do it to protect my environment | 1 item | N/A |
Perceived severity disease | Meningococcal disease is a severe disease | 1 item | N/A |
Perceived susceptibility disease | I am concerned that I will get meningococcal disease | 1 item | N/A |
Perceived severity side effects | I fear the side effects of the MenACWY vaccination | 1 item | N/A |
Omission bias | I prefer to get meningococcal disease, instead of getting vaccinated against meningococcal disease and risking the side effects | 1 item | N/A |
Outcome expectations | Accepting the MenACWY vaccination is good for my health | Adolescents: 3 Parents: 3 | α = 0.773 α = 0.751 |
Organizational factors | |||
Organization (time) | The planned appointment suited me well | 1 item | N/A |
Organization (location) | The location was easy accessible | 1 item | N/A |
Organization (provider) | Public health services are a good place to receive vaccinations | 1 item | N/A |