Table 1.

Policies included in the DCE.

Shorthand description of the policy	Level of intervention	Description of the policy in the DCE
(1) Vaccination at home	Enable choice	People are given the option of getting vaccinated at home.
(2) Vaccination when and where convenient	Enable choice	People are given the option of getting vaccinated in the evening or during weekends and at locations in the neighborhood such as schools, community centers and pharmacies, or at a drive-through location.
(3) Vaccination ambassadors	Guide choice through changing the default	An intensive public campaign to encourage people to get vaccinated. Celebrities in The Netherlands who have been vaccinated act as ambassadors and try to convince other people.
(4) Pay €250 if does not get vaccinated	Guide choice through disincentives	Adults who do not get vaccinated pay a one-time extra 250 euros health insurance premium. Exception is made for people who cannot be vaccinated for medical reasons.
(5) Receive €100 if gets vaccinated	Guide choice through incentives	Adults who get vaccinated receive a one-time discount of 100 euros on their health insurance premium.
(6) Vaccination passport daily activities during outbreak	Guide choice through incentives	People who get vaccinated receive a vaccination passport that allows them to continue to visit certain places (such as stores, bars and restaurants, nursing homes, fitness centers, and public transportation) when there is an outbreak of the virus in their region. People who do not get vaccinated may be refused entry during an outbreak. The passport will not take effect until all adults in The Netherlands have had the opportunity to get vaccinated.
(7) Vaccination passport large events	Guide choice through incentives	People who get vaccinated receive a vaccination passport that allows them to visit certain places where large groups of people gather and it is not possible to keep 1.5 meters distance (such as concerts, festivals, sporting events, and other large-scale gatherings). People who do not get vaccinated may be refused entry. The passport will not take effect until all adults in The Netherlands have had the opportunity to take the vaccine.
(8) Counseling if does not get vaccinated	Guide choice through disincentives	Adults who do not get vaccinated must have a mandatory counseling interview with a doctor who has received special training on how to stimulate people to get vaccinated. People who refuse this interview will be fined 100 euros.
(9) Mandatory testing at own cost if does not get vaccinated	Restrict choice	Adults who do not get vaccinated must have a COVID-19 test every 2 weeks at their own expense (95 euros each time) when there is an outbreak of the virus in their region or self-quarantine during the outbreak.

DCE indicates discrete choice experiment.