According to Datta (Datta, 1976 & Lee et al.,1990) who summarized 31 studies, the program showed immediate improvement in the IQ scores of participating children.

• Children who attended Head Start are significantly more likely to complete high school, attend college, and possibly have higher earnings in their early twenties.
• They are less likely to have been booked or charged with a crime.
• Head Start is associated with large and significant gains in test scores.
• Head Start significantly reduces the probability that a child will repeat a grade