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Table 1 Survey measures

From: Dynamics in public perceptions and media coverage during an ongoing outbreak of meningococcal W disease in the Netherlands

Variable Survey question and itemsa Answer categories Cronbach’s Alphab
MenACWY vaccination intention – child Do you want your youngest child to be vaccinated against meningococcal disease type A, C, W, and Y? 0 certainly not – 6 certainly yes
MenACWY vaccination intention – self Do you want to be vaccinated against meningococcal disease type A, C, W, and Y? 0 certainly not – 6 certainly yes
Perceived probability IMD – child - Do you think that your youngest child may get sick due to meningococci in the following 12 months? In your opinion, how likely is this? 0 very unlikely – 6 very likely 0.9
- Do you think that your youngest child may get sick due to meningococci in his/her life? In your opinion, how likely is this? 0 very unlikely – 6 very likely  
Perceived probability IMD – self - Do you think that you may get sick due to meningococci in the following 12 months? In your opinion, how likely is this? 0 very unlikely – 6 very likely 0.8
- Do you think that you may get sick due to meningococci in your life? In your opinion, how likely is this? 0 very unlikely – 6 very likely  
Perceived severity IMD – child How would it be for you if your youngest child got sick due to meningococci? 0 not at all severe – 6 very severe
Perceived severity IMD – self How would it be for you if you got sick due to meningococci? 0 not at all severe – 6 very severe
Attitude menACWY vaccination (negative – positive) […] What do you think about the decision regarding the vaccination against meningococci type A, C, W, and Y? I think it is …   0.9
- 0 unnecessary – 6 necessary   
- 0 acceptable – 6 unacceptablec   
- 0 safe – 6 dangerousc   
- 0 poor – 6 good   
- 0 Not self-evident – 6 self-evident   
Trust in government […] What do you think about our government when it comes to infectious diseases and vaccinations? […] 0 completely disagree, 1 disagree 2 do not agree nor disagree, 3 agree, 4 completely agree 0.9
- The government has sufficient knowledge and skills with regard to infectious diseases and vaccinations.  
- The government communicates openly about infectious diseases and vaccinations.  
- The government puts the health of citizens above economic interests when it comes to vaccinations   
Trust in RIVM [...] What do you think about the RIVM when it comes to infectious diseases and vaccinations? […] 0 completely disagree, 1 disagree 2 do not agree nor disagree, 3 agree, 4 completely agree 0.9
- The RIVM has sufficient knowledge and skills with regard to infectious diseases and vaccinations.  
- The RIVM communicates openly about infectious diseases and vaccinations.  
- The RIVM puts the health of citizens above economic interests when it comes to vaccinations  
Trust in pharmaceutical companies [...]What do you think about pharmaceutical companies when it comes to infectious diseases and vaccinations? […] 0 completely disagree, 1 disagree 2 do not agree nor disagree, 3 agree, 4 completely agree 0.7
- Pharmaceutical companies have sufficient knowledge and skills with regard to infectious diseases and vaccinations.  
- Pharmaceutical companies communicate openly about infectious diseases and vaccinations.  
- Pharmaceutical companies put the health of citizens above economic interests when it comes to vaccinations  
  1. aSee Supplementary file 2 for the exact wording of questions and items per survey (small adaptations were made in follow-up surveys to adopt to changing context and insights)
  2. bIndicating internal scale consistency with a value between 0 (minimum) and 1 (maximum)
  3. cFor these items, the scale was inverted prior to constructing the scale