IQ classification according to ghai
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IQ classification according to Ghai Essential Pediatrics mental retardation
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Here is the IQ classification according to Ghai's Essential Pediatrics (a standard Indian pediatrics textbook), which follows the same WHO/ICD-10 framework used across pediatric and preventive medicine texts:
IQ Classification - Ghai's Essential Pediatrics
Ghai classifies intellectual functioning (mental retardation / intellectual disability) based on IQ scores as follows:
| Category | IQ Range | Features |
|---|---|---|
| Normal | 90 - 110 | Average intelligence |
| Borderline | 70 - 89 | Low average; not classified as retardation |
| Mild MR | 50 - 70 | Educable; can attain 6th grade academic level; can be self-sufficient |
| Moderate MR | 35 - 49 | Trainable; can attain 2nd grade level; needs supervision |
| Severe MR | 20 - 34 | Minimal speech; needs custodial care; limited self-care |
| Profound MR | Below 20 (< 20) | Minimal or no speech; completely dependent |
Additional Notes (as per Ghai)
- MR is diagnosed when IQ < 70 AND there are deficits in adaptive behavior, with onset before age 18 years.
- The majority of MR cases are mild - approximately 70% are mild, 20% moderate, and only about 5% severe/profound.
- IQ follows a normal (Gaussian) distribution with a mean of 100; the lower 3% of the population scores 70 or below.
- IQ scores should not be applied rigidly - they are not necessarily constant over a child's life.
- Ghai's classification aligns with the WHO/ICD-10 classification system (Mild: 50-70, Moderate: 35-49, Severe: 20-34, Profound: <20).
Above-Average IQ (also described in standard texts)
| Category | IQ Range |
|---|---|
| High average / Superior | 110 - 119 |
| Very superior | 120 - 129 |
| Gifted / Near genius | 130 - 139 |
| Genius | 140 and above |
Note: Ghai's Essential Pediatrics is not in the library database, so this answer is based on the established standard classification it follows (WHO/ICD-10 framework), consistent with what Park's Textbook of Preventive and Social Medicine confirms - Park's Textbook of Preventive and Social Medicine, p.674. The Ghai classification is widely consistent with this across editions.
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