In Virginia, one study found that early reading skills were at a 20-year low this fall, which the researchers described as “alarming.”

In the Boston region, 60 percent of students at some high-poverty schools have been identified as at high risk for reading problems — twice the number of students as before the pandemic, according to Tiffany P. Hogan, director of the Speech and Language Literacy Lab at the MGH Institute of Health Professions in Boston.

Children in every demographic group have been affected, but Black and Hispanic children, as well as those from low-income families, those with disabilities and those who are not fluent in English, have fallen the furthest behind.

“We’re in new territory,” Dr. Hogan said about the pandemic’s toll on reading. If children do not become competent readers by the end of elementary school, the risks are “pretty dramatic,” she said. Poor readers are more likely to drop out of high school, earn less money as adults and become involved in the criminal justice system.