Normal person: 85~115 points; smart person: 120~140 points; genius: 140~200 points; borderline value: 71~84;

Mild mental retardation: 50~ 70 points, the intelligence is equivalent to that of a child aged 8 to 10 years old

Moderate mental retardation: 35 to 49 points, the intelligence is equivalent to that of a child aged 3 to 5 years old

Severe mental retardation: 20 to 34 points, the quality is equivalent to that of a 3 to 5-year-old child

Extremely severe mental retardation: below 20 points, the intelligence is equivalent to that of a 2-year-old baby