Symptoms can vary from normal to severe developmental delay or mental retardation.

症状变化较大，可以是正常的或严重的发育延迟或智力低下。

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Method:Forty-eight children and adolescents diagnosed with autism or mental retardation accompanying with behavior disorder were treated by aripiprazole.

目的：观察阿立哌唑治疗儿童孤独症和精神发育迟滞的多动及冲动等行为障碍的疗效及不良反应。

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Kelley and colleagues searched the Mayo Clinic database for patients who began to develop dementia between 17 and 45 years that was not related to trauma, brain infections or mental retardation.

Kelley及其同事们研究了梅奥医院中那些没有外伤、大脑传染病或智力延迟因素，年龄在17 ~ 45岁开始发生痴呆疾病的患者的临床数据。

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Even with antibiotic treatment, at least 10% of patients die with another 10 to 20% left with permanent problems, such as mental retardation, deafness or epilepsy.

BBC: Meningitis A vaccine hope

During the interviews, the researchers asked parents whether their kids had been diagnosed with autism, ADHD, learning disabilities, cerebral palsy, seizures, stuttering or stammering, hearing loss, blindness, or intellectual disability (formerly known as mental retardation).

CNN: CDC: Autism, ADHD rates on the rise

In 2009, 4.7 million Americans received SSI or SSDI because of mental illnesses, not including mental retardation, a tenfold increase since 1977.

WSJ: E. Fuller Torrey: Fifty Years of Failing America's Mentally Ill