IQ RANGE Level of Mental Retardation Range of IQ Test Scores and Levels of Necessary Support IQ score: 50–55 to approximately 70–75 Mild mental retardation Intermittent supports are provided on an as-needed basis. Students do not necessarily require continuous or daily support. IQ score: 35–40 to 50–55 Moderate mental Limited supports are provided over a prescribed period of time. retardation Intermittent and extensive supports may be necessary for some students as well. IQ score: 20–25 to 35–40 Severe mental retardation Extensive supports are provided, usually involving assistance on a daily basis in a number of settings. IQ score: Below 20–25 Profound mental retardation Pervasive supports are provided usually involving constant assistance across all environments, often of high intensity and may include life-sustaining measures. Raver S.A.Excerpt from Early Childhood Special Education - 0 to 8 Years: Strategies for Positive Outcomes. 2009 edition, p. 228. IQ Range ("deviation IQ") 140 and over IQ Classification Very superior 120–139 Superior 110–119 High average 90–109 Normal or average 80–89 Low average 70–79 Borderline defective Below 60 Mentally defective Kaufman . IQ Testing 101 .New York: Springer, 2009.
