Table 1.

Measurement of main constructs.

Construct	Measurement
Social Trust	Generally speaking, would you say that most people can be trusted, or that you can't be too careful in dealing with people? 0. You can't be too careful … 10. Most people can be trusted
Vulnerability to COVID-19	According to the National Institute for Public Health, people who are older than 70, or have a long-term medical condition (e.g., lung diseases, heart diseases, diabetes, kidney diseases, obesity, etc.), or have immunodeficiencies are at a higher risk of getting very sick from the coronavirus. Are you in this high-risk category for the coronavirus? 1. Yes, 0. No Do you think you are or have been infected with the coronavirus? 1. Yes, 0. No How likely do you think that you will be infected in the next two months? (End of March) 1. No chance … 8. It already happened Do you know anyone among your close contacts (i.e., people with whom you discuss or share personal matters) who has tested positively for the coronavirus or has seen a doctor who confirmed that it is likely that he/she is or has been infected with the coronavirus? 1. Yes, 0. No
Agreement with lockdown-norms [A] and [B]	During the lockdown in April, it was appropriate for people in the Netherlands who had any [A]/no [B] symptoms of an infection (e.g., nose cold, sore throat, cough, fever) to stay home and avoid social contacts. 1. Strongly disagree … 5. Strongly agree
Perceived compliance with lockdown-norms [A] and [B]	Out of every 100 people who had any [A]/no [B] symptoms of an infection, how many do you think stayed home during the lockdown and avoided social contacts? Number: 0 … 100
Perceived agreement with lockdown-norms [A] and [B]	Out of every 100 people, how many do you think agree with statement A/B? Number: 0 … 100

Note. Social Trust was measured in May/June 2019 and July 2020. Perceived chance of being infected was measured at the end of March 2020 in the “Effects of the Outbreak of COVID-19” study. All other variables were measured in July 2020.