About 90 000 people from 18 countries were screened for signs of depression using a standard test with questions. They found that people living in developed countries are more likely to get depressed than people in developing and poor countries. In the 10 richest countries in the world 15% of respondents at least once in their lives experienced depression, compared with 11% in the poorest countries.
Interestingly, it is in rich countries poor people are more prone to depressive disorders. Apparently, this is due to the strong difference in the standard of living of the rich and poor people in developed countries.
What country can be called the most "depressed" in the world? According to researchers, it is France with 21% of respondents have experienced depression, and the US with 19%.