An intellectual disability is characterized by a decrease in mental abilities and intelligence below the normal average for a person’s age, accompanied by difficulties in social adaptation that appear before age 18.
What is Intellectual Disability and How is it Diagnosed?
This disorder occurs when the intelligence quotient (IQ) is two standard deviations below the average (approximately 70-75 points), along with deficits in adaptive behavior in at least two of the following areas:
- Intellectual skills: Including language, communication, and understanding time.
- Social skills: Including responsibility, making friends, and interacting with others.
- Practical skills: Including personal care, work, and leadership.
Diagnosis is based on comparing “mental age” (the child’s performance level on intelligence tests) with chronological age; the wider the gap between them, the more severe the condition.
Levels and Classifications of Intellectual Disability
Estimates for determining levels vary, but they can generally be divided into:
- Mild intellectual disability: Represents 85% of cases, with an IQ ranging from (50-55 to 70) or (55-69) points. These individuals can learn basic academic skills up to the sixth grade and communicate with others.
- Moderate intellectual disability: Represents 10% of cases, with an IQ between (35-45 to 50-55) or (40-54) points. These children require external assistance due to a lack of certain life skills.
- Severe intellectual disability: Represents 4% of cases, with an IQ between (25-30 to 35-40) or (25-39) points. The child may acquire some words and perform a minimum level of self-care.
- Profound intellectual disability: Represents 1% of cases, where the IQ is below 24 or 25 points, and the child is unable to care for themselves.
Intellectual Disability Symptoms and Signs
Intellectual disability symptoms manifest in several aspects of a child’s development, including:
- Developmental delays: Delayed speech and language comprehension, delayed walking or frequent stumbling, and slowness in learning self-reliance skills such as dressing.
- Cognitive and social difficulties: Memory problems, difficulty following instructions, and a lack of interest in age-appropriate toys.
- Behavioral and neurological disorders: Hyperactivity, aggression, sleep problems, or seizures.
- Other associations: Between 50-75% of children with autism also experience this disorder.
Causes and Prevention Methods
Various factors can lead to a child with intellectual disability, including:
- Prenatal: Genetic defects (such as Down syndrome or Fragile X syndrome), maternal infections like rubella or syphilis, or the use of alcohol, tobacco, and certain medications (such as warfarin) during pregnancy.
- Perinatal: Low birth weight, premature birth, or abnormal pressure on the head during delivery.
- Postnatal: Infections such as chickenpox or whooping cough, head injuries, drowning, or lead and mercury poisoning.
Prevention methods:
Risks can be reduced through medical care for the pregnant woman, avoiding pollutants, conducting comprehensive newborn screenings, adhering to vaccination schedules (such as rubella and Hepatitis B vaccines), and providing proper nutrition and a safe environment for children.
How to Support a Child with Intellectual Disability?
There are no medications to prevent the condition from occurring, but intervention focuses on:
- Educational and training programs to increase the child’s ability to integrate into society and care for themselves.
- Enrollment in specialized care centers.
- Following a healthy lifestyle that includes exercise and a balanced diet to prevent obesity.
Upon diagnosis, a doctor examines the head circumference, the nervous system, vision, and hearing, and may request CT scans, MRIs of the head, or genetic tests.
Frequently Asked Questions
What is the difference between intellectual disability and mental illness?
An intellectual disability results from deficits in intellectual functions and adaptive behavior, whereas mental illness stems from psychological causes and does not necessarily require an adaptive deficit.
Can intellectual disability be completely cured?
There is no radical cure to prevent it, but early intervention and educational programs improve the quality of life and the adaptive capacity of the affected person.
Do all learning disabilities mean there is an intellectual disability?
No. Learning disabilities (which affect 10% of children) impact academic skills like reading and arithmetic, but those affected are capable of adapting and coexisting. In contrast, an intellectual disability (which affects 3%) involves a deficit in both intelligence and adaptive behavior.
When should I consult a doctor?
You should consult a specialist if you notice a significant delay in speech, delays in walking and motor skills, or if the child does not respond to simple instructions compared to peers of the same age.
Disclaimer: This content is for educational purposes only and is not a substitute for professional medical advice.
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Illustration: AI-generated
approved by: Medica Health team