From the report: "Similar to previous research, we find that losses were larger in lower-income and minority districts and in districts which remained remote or
hybrid for longer periods during the 2020-21 school year. Among districts, the math learning loss per week of remote/hybrid instruction was larger in high-minority and high-poverty districts. Within districts, however, White students and non-economically disadvantaged students lost about the same amount of ground as Black, Hispanic and economically disadvantaged students."