Moderate mental retardation mainly includes mental impairment caused by mental development defects, and mental retardation with obvious social adaptation difficulties. Among them, the intellectual damage caused by mental retardation refers to those whose mental development continues to stay at a significant level, accompanied by motor and language retardation; Mental retardation with near-average intelligence but obvious social adaptation difficulties refers to those with near-average intelligence development and social adaptation difficulties, and the degree of difficulty is equivalent to 4-55 IQ points.
The above is the relevant answer about IQ between 4 and 55, and I hope it can solve your problem.