Intellectual Development Disorder

Below average intelligence and set of life skills present before age 18.
Intellectual function can be measured with a test.
The main symptom is difficulty thinking and understanding. Life skills that can be impacted include certain conceptual, social, and practical skills.
Special education and behavioral therapy can help a person live to his or her fullest.


Cluster Number:
Wiki Number: W107
Diagnosis: Intellectual Development Disorder
US Patients: 2-3%
World Patients:
Sex Ratio:
Age Onset:
Brain Area:
Causes: Mental Retardation and Autism Spectrum make up the greatest proportions
Medications: antipsychotics and benzodiazepines
Therapies: careful analysis and years of good teaching; educable = IQ of 50-75;

Youtube Video:

What are the causes of Intellectual Developmental Disorder?

Amazon or Library Book: Job Readiness Workbook

Support Group:

(This is a private group, entitled “Parents of Adults with Developmental Disabilities and Other Support Needs.”)

Contact your local Social Security office for possible Disability Benefits through their Disability Determination Services,

Section 12.05.


The world-wide medical research
reports chosen for each diagnosis 

Clicking each title opens the
PubMed article’s summary-abstract.

  • Cross-Cultural Comparison of the Contexts Associated with Emotional Outbursts
    by Justin Cheuk Yin Chung on August 19, 2022

    The causal relationship between emotional outbursts and emotion dysregulation is proposed to be heterogeneous, but cultural influences have not been considered despite established cultural differences in emotional processes (e.g., increased motivation to suppress emotions in interdependent cultures). Responses to the Brazilian Portuguese version of the Emotional Outburst Questionnaire were collected from 327 caregivers of young people (6-25 years) with autism spectrum disorder, Down's syndrome,...

  • CAPRIN1 haploinsufficiency causes a neurodevelopmental disorder with language impairment, ADHD and ASD
    by Lisa Pavinato on August 18, 2022

    We describe an autosomal dominant disorder associated with loss-of-function variants in the Cell cycle Associated PRoteIN 1 (CAPRIN1; MIM*601178). CAPRIN1 encodes a ubiquitous protein that regulates the transport and translation of neuronal mRNAs critical for synaptic plasticity, as well as mRNAs encoding proteins important for cell proliferation and migration in multiple cell types. We identified twelve cases with loss-of-function CAPRIN1 variants, and a neurodevelopmental phenotype...

  • Trends of the disease burden of intellectual disability among children and adolescents from 1990 to 2019 in China
    by X J Yan on August 18, 2022

    Objective: This study aims to analyze the disease burden of intellectual disability among Chinese children and adolescents aged 0-19 years in 2019 and its trends from 1990 to 2019. Methods: Data were gathered from the Global Burden of Disease study. The prevalence and years lived with disability (YLDs) of intellectual disability among Chinese children and adolescents were compared with the global average by gender, age group, and severity of disability in 2019. Joinpoint regression model was...

  • Psychiatric diagnostic dilemmas among people with intellectual and developmental disabilities
    by L R Charlot on August 17, 2022

    CONCLUSION: Individuals in the current study had serious psychiatric and behavioural problems despite psychiatric care in their communities. The majority of psychiatric diagnoses provided upon referral were not supported by the multidisciplinary specialty team's assessment. In addition to possible diagnostic inaccuracy, the group in the study suffered from multiple medical co-morbidities and were exposed to polypharmacy. Results emphasise the importance of multidisciplinary evaluation by...