Stanford-Binet IQ changes in the Harvard growth study

Abstract

There is a median change of 7 points in IQ on repetition of the Stanford-Binet examination in the Harvard growth study of 1200 children. The very inferior (IQ below 80) are most consistent, and the very superior (IQ 120 or over) are least consistent. (PsycInfo Database Record (c) 2025 APA, all rights reserved)