Fig. 2

Education-related inequality in four COVID-19 prevention and testing indicators: median adjusted Slope Index of Inequality (SII) compared to national averages (%), globally and by country income group (UMD-CTIS, June–December 2021). Notes: Blue symbols represent countries. Orange lines show the medians across countries. Black dashed line shows no inequality (zero). Adjusted SII controlling for individual sociodemographic characteristics (age, sex, place of residence, and household overcrowding) plus the presence of health risk factors and COVID-like symptoms (Adjusted2), apart from the variable “Believe that social distancing and/or wearing a face mask is very or moderately effective for preventing the spread of COVID-19” for which estimates for Adjusted are shown