The data from abroad is equally clear: one-third of those with mild intellectual disability and more than one-half of those with moderate or more severe intellectual disability suffer from psychiatric disorders or severe emotional and behavioral problems.
國外資料更顯示，輕度智障者有三分之一、中重度以上者超過二分之一，曾出現精神疾病問題或嚴重的情緒及行為問題。