Table 1. Main measures in baseline and follow up questionnaires of the Corona Behavioral Unit cohort study, April 2020 –September 2022.

Module	Topics
Demographics (baseline)	Sex, age, municipality, education, country of birth, vulnerable health, living conditions, work, financial situation, 1.5m distancing in work situation, persistent complaints after COVID-19 infection.
Demographics (follow-up)	Sex, age, vulnerable health, living conditions, work, 1.5m distancing in work situation, work, financial situation, persistent complaints after COVID-19 infection.
Vaccination, testing, infection	• COVID-19 vaccination, symptoms, (self-)testing, infection, adherence to quarantine and isolation measures.
Behavior	• Adherence to COVID-19 preventive measures: washing hands, use of paper towel, sneezing in elbow, keeping distance (in certain situations), not shaking hands, wearing face masks, working from home, ventilating the house. • Social activity and mobility: number of times leaving the house in different situations, having visitors at home, visiting others, going on holidays, visiting high risk countries.
Wellbeing	• Self-perceived general health, satisfaction with life, mental health, loneliness, quality of social contacts, coping with COVID-19 situation, COVID-19 pandemic fatigue, experiences positive and negative effects. • Lifestyle & health: exercise, dietary patterns, alcohol use, smoking.
Trust and Media use	• Trust in the COVID-19 approach of the Dutch government, comparing the Dutch approach to other countries, conversations with others about the approach. • Following the news on COVID-19, important source of information about the corona virus. • Procedural and distributive justice.
Policy Support	• Policy support for current (at time of data collection) and future COVID-19 measures as taken by the Dutch government. • Procedural and distributive justice (i.e., how people feel they’re being treated, and whether they experience the Dutch government’s measures as being fair).
Determinants of adherence	• COVID-19 risk perception (i.e., estimation of chance and seriousness of getting infected yourself or infecting others; concerns about a new corona virus variant). • Emotional response (i.e., the perception of how fast the virus is spreading and how much worry, stress, fear people experience). • Self-efficacy (i.e., the participant’s self-appraisal of their own competencies to comply to specific COVID-19 preventive measures). • Response efficacy (i.e., the perceived effectiveness of adherence to the COVID-19 preventive measures for reducing the spread of the virus). • Descriptive norms (i.e., the perception of which specific COVID-19 preventive measures are typically performed by significant others).

Note. From round 15 onwards, items on procedural justice are included in the Policy Support module, in addition to the Trust and Media use module.