The Centers for Disease Control and Prevention relaxed its social distancing guidelines for schools Friday, saying students can now sit 3 feet apart in classrooms.

The revised COVID-19 recommendations represent a turn away from the 6-foot standard that has forced some schools to remove desks, stagger scheduling and take other steps to keep children away from one another.

Three feet “gives school districts greater flexibility to have more students in for a prolonged period of time,” said Kevin Quinn, director of maintenance and facilities at Mundelein High School in suburban Chicago

In recent months, schools in some states have been disregarding the CDC guidelines, using 3 feet as their standard. Studies of what happened in some of them helped sway the agency, said Greta Massetti, who leads the CDC’s community interventions task force.

While there is evidence of improved mental health and other benefits from in-person schooling, “we don’t really have the evidence that 6 feet is required in order to maintain low spread,” she said.