Denominators
Population is the World Bank total population series (SP.POP.TOTL) for the year of the count, or 2024 where the source gave no year. Taiwan has no World Bank row. Its ratio uses the Ministry of the Interior year-end 2024 population as reported in Taipei Times secondary coverage. That population figure comes from a search snippet; the page has not been opened. A count from 2015 divided by the 2015 population is a 2015 ratio, not a current one. Ratios stated by the source itself are shown separately in each country's detail.
Per 100,000 is the convention in the AUA, BAUS, and CNOM material; per million is the convention in the Chinese census and much of the African literature. Both are offered.
Why counts are not comparable
A German count of active specialists includes office-based urologists who do not operate. A UK count of substantive consultants excludes 500 SAS and trust-grade urologists who do. A society roll can exceed the number of urologists in the country. Read the basis chip before comparing two countries. The map starts with Count and All figures, mixed bases. Choose Registry or census only to limit the map and ranking to those sources. Even registry and census definitions differ.