定义很宽。

https://www.who.int/news-room/fact-sheets/detail/mental-disorders

Johns Hopkins 说是1/4的人有：

• An estimated 26% of Americans ages 18 and older -- about 1 in 4 adults -- suffers from a diagnosable mental disorder in a given year.

这个说的更吓人：

Mental illnesses are common in the United States. It is estimated that more than one in five U.S. adults live with a mental illness (57.8 million in 2021). Mental illnesses include many different conditions that vary in degree of severity, ranging from mild to moderate to severe.?

https://www.nimh.nih.gov/health/statistics/mental-illness?

好像?mental illness?比Mental disorders严重

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