Young children with multiple risk factors are more likely to fare poorly in achieving benchmarks for early school success.Expulsion rates for young children in preschool are three times higher than children and youth in K-12 grade.
— Among young children, 4-year-olds’ expulsion rates were 50 percent greater than for three year olds.

— Boys were four times more likely to be expelled than girls

Source: NCCP, Social-emotional Development in Early Childhood  What Every Policymaker Should Know
Authors: Janice L. Cooper, Rachel Masi, and Jessica Vick
Publication Date: August 2009