The answer was: one in four, according the World Health Organisation and the World Federation for Mental Health.
答案是四分之一，根据世界卫生组织以及世界心理健康联盟的数据统计。
英语百科
World Federation for Mental Health
The World Federation for Mental Health (WFMH) is an international, multi-professional non-governmental organization (NGO), including citizen volunteers and former patients. It was founded in 1948 in the same era as the United Nations (UN) and the World Health Organization (WHO).