Punishment and Inequality at an Early Age: Exclusionary Discipline in Elementary School.
Level 3 - non-randomized controlled study
Prospective observational cohort study (secondary analysis of longitudinal birth cohort data).
PubMed 31258199 · doi:10.1093/sf/soy072
What was done
The authors analyzed parent and child reports from the Fragile Families Study, a birth cohort of children born between 1998 and 2000 in large US cities. They evaluated the cumulative prevalence of exclusionary discipline (suspension or expulsion) by age nine (third grade), examined racial disparities, and assessed the longitudinal association between exclusionary punishment and aggressive behavior using multivariable regression, individual fixed-effects, and matching methods.
What was found
More than 1 in 10 children were suspended or expelled by age nine. Substantial racial disparities were documented: approximately 40% of non-Hispanic Black boys had been suspended or expelled compared to 8% of non-Hispanic White or other-race boys. These disparities were primarily explained by differences in school and home environments rather than prior behavior problems. Receiving exclusionary discipline was significantly associated with subsequent increases in aggressive behavior, a relationship that did not vary by race and remained robust across fixed-effects and matched specifications.
Why it matters
This study demonstrates that exclusionary school discipline occurs at high rates in early elementary school, falls disproportionately on Black boys due to environmental context rather than behavioral differences, and is linked to worsened behavioral trajectories.
Limits
The total sample size was not reported in the abstract. The observational design cannot definitively rule out unmeasured time-varying confounding despite fixed-effects modeling. Findings are based on an urban birth cohort born between 1998 and 2000 and may not generalize to suburban, rural, or contemporary school environments.