WB health data for classification

The WorldBank health data set has been compiled by the authors using Health data from the World Bank DataBank (https://data.worldbank.org, accessed May, 2023.) Among others, the DataBank offers country data for a variety of health indicators. We have filtered all health indicators for the Health Nutrition and Population Statistics database, for the year 2021, for all countries. We have eliminated all indicators that have missing values for more than 75% of the countries. The rest of the missing values in the data were replaced with the average value of their Region. Each year, countries are classified by the World Bank into four income categories: High Income, Upper-middle Income, Lower-middle Income, Low Income, and Not classified. Based on this information, we proposed two classes: lower-income countries (46 countries) and upper-income classes (140 countries).