After computing Cronbach’s alpha for the PSS‐10 for all the countries and areas separately and jointly, we tested multilevel regression models, using Jamovi (Version 1.2.16.). In these models, participants were nested within countries, and the number of adults, children, marital status, education level, and gender were group‐mean‐standardised. In the first model, we regressed a composite score of perceived stress levels on the number of adults and the number of children, as well as participants’ gender, age, marital status, education level, COVID‐19 severity (the number of confirmed cases at the time of data collection (World Health Organization, 2020a, 2020b), divided by the number of the country’s citizens (Worldometer, 2020; Level‐2 variable), and culture (i.e. collectivistic vs. individualistic: Level‐2 variable). The first model we created included a random intercept of stress on a country level. The second model differed, as we additionally estimated random slopes of the number of children. The third model tested for potential curvilinear links by adding two variables in a squared form (i.e. the number of adults and children). The final, fourth model included random intercept for the stress level as well as all random slopes for age, gender, and marital status.