1. The data covered 173 countries in 2023, but the number was lower in years before the mid-1990s. The only country to be dropped from the data set is the German Democratic Republic, which was covered from 1975 to 1990.
2. The survey covers Brazil, Chile, Colombia, Denmark, The Gambia, India, Iraq, Italy, Lebanon, Lithuania, Pakistan, Romania, Senegal, Sierra Leone, the Solomon Islands, South Korea, Taiwan, Tanzania and the United States.
3. The nature of the sample varies slightly from country to country. In 16 of the 19 countries, the main sample (1,000 people) was nationally representative. In Colombia, India and Taiwan, the sample was online representative.
4. One significant exception to this approach is the Solomon Islands, where the small population posed significant challenges for data collection, and the sample size was only 526 people, 309 of whom were in the lowest income category
International IDEA, Democracy Tracker Methodology and User Guide (Stockholm: International IDEA, 2024d), <https://doi.org/10.31752/idea.2024.17>