Original sentence: A large body of research indicates that IQ ("intelligence quotient") and similar measures vary between individuals and between certain groups, and that they correlate with socially important outcomes such as educational achievement, employment, crime, poverty and socioeconomic status
Edited sentence: A large body of research indicates that intelligence measures such as intelligence quotient (IQ) varies between individuals and between certain groups, and that they correlate with socially important outcomes such as educational achievement, employment, crime, poverty and socioeconomic status