Table 1 Overview of constructs measured by the survey

Instrumental attitude

Getting vaccinated against influenza every year in October/ November would be: very good – very bad

Experiential attitude

When I think of getting vaccinated against influenza annually, it makes me: very anxious – not at all anxious

Injunctive norm

Most people who are important to me think I should get vaccinated against influenza annually. agree – disagree

Descriptive norm

Most physicians get vaccinated against influenza annually. very unlikely – very likely

Capacity

I am confident that I can get vaccinated against influenza next October/ November, if I want to. true – false.

Autonomy

Getting vaccinated against influenza annually is up to me. agree – disagree

Behavioral beliefs (self-protection and patient protection)

Getting vaccinated against influenza annually will result in fewer influenza infections and less work absenteeism. very likely – very unlikely; Getting vaccinated against influenza annually will prevent at-risk patients from getting influenza. true – false

Knowledge about recommendations

I know about the national recommendations for health care workers to get vaccinated against influenza annually, in order to protect themselves and patients against influenza infections. true – false

Injunctive normative belief

My future employer will think that: I should – I should not get vaccinated against influenza annually.

Control belief

I expect that most hospitals enable their employees to get vaccinated against influenza annually at work. very likely – very unlikely.

Intention

I intend to get vaccinated against influenza next October/ November. very unlikely – very likely.

Barrier (high workload)

Imagine that on the day you get offered influenza vaccination at work, you are under a lot of time pressure and barely have time to take a break. How likely is it that you will still get vaccinated against influenza? very likely – very unlikely