- Previous meta-analyses had little or no inclusion criteria and therefore included studies regardless of quality.
- Authors found that students moving from almost completely segregated environments to predominantly white schools showed a sizable effect (1.06). This is equivalent to about a two-month gain or benefit for desegregated students.
- The effect size for reading achievement (.57) was considerably larger than that for math (.33), though the difference is not statistically significant.
- They found a curvilinear pattern of effects with an increase from grades 1-7 and a decrease from 8-12.
- NIE meta-analysis revealed an effect size of .14, with a .28 effect for reading and a .23 effect for math.