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Table 3 Intelligence Quotient (IQ)

From: Prader-Willi syndrome: A primer for clinicians

     Intelligence Quotient
     Degree of Mental Retardation (%)
Investigator Year Number enrolled Mean Age* Normal -Borderline Mild Moderate Severe
Einfelda [47] 1999 46 17.7 21.6 64.9 13.5 0
Gross-Tsurb [51] 2001 18 14.3 73 27 0 0
Deschee-Maeker [52] 2002 55 14.1 25.4 27.3 40 7.3
Whittington [53] 2004 55 21.0 31 41.8 27.2 0
Copet [54] 2010 85 24.2 7 54 39 0
Roof [55] 2000 47 23.2 24 38 30 8
  1. a. Only 1/2 of subjects genetically confirmed, most IQ's from records
  2. b. Did not give a measure of adaptive functioning
  3. *Age in Years