Table 1 ICD - 10 diagnostic criteria for mental retardation
Category | Mental Retardation | IQ Range | Median IQ | Mental Age Range (Years) | Median Mental Age |
|---|---|---|---|---|---|
F 70 | Mild | 50 - 69 | 60 | 9 to under 12 (9 - 11) | 10 |
F 71 | Moderate | 35 - 49 | 42 | 6 to under 9 (6 - 8) | 7 |
F 72 | Severe | 20 - 34 | 27 | 3 to under 6 (3 - 5) | 4 |
F 73 | Profound | Below 20 | 10 | Less than 3 (0 - 2) | 1 |