Geographical distribution of registered trials by WHO (1999 - 2022)

According to the WHO, a comprehensive analysis of clinical trials registered between 1999 and 2022 revealed that the USA leads with the highest number of studies at 168,520, followed by China with 94,193, Japan with 63,499, and India with 54,891. The following snapshot provides details on the top 20 countries with the highest number of registered studies.