Large numbers of students are not returning to the classroom even as more schools reopen for full-time, in-person learning, according to a survey released Wednesday by the Biden administration.

The findings reflect a nation that has been locked in debate over the safety of reopening schools. Even as national COVID-19 rates continued to ebb in February, key measures around reopening schools barely budged.

Nearly 46% of public schools offered five days a week of in-person to all students in February, according to the survey, but just 34% of students were learning full-time in the classroom. The gap was most pronounced among older K-12 students, with just 29% of eighth graders getting five days a week of learning at school.

There were early signs of a shift, however, with more eighth grade students moving from fully remote to hybrid learning.

With the new findings, President Joe Biden came no closer to meeting his goal of having most elementary schools open five days a week in his first 100 days. Just shy of half the nation’s schools offered full-time learning in February, roughly the same share as the previous month.

Despite the slow progress, federal education officials see it as a step forward.

“There was a decrease in enrollment in remote-only learning and an increase in hybrid instruction at grade eight, providing evidence that more students are walking through school doors again,” Mark Schneider, director of the Education Department’s Institute of Education Sciences, said in a statement.

The findings are based on a survey of 3,500 public schools that serve fourth graders and 3,500 schools that serve eighth graders. It’s based on data from schools in 37 states that agreed to participate. This is the second round of data released from a new survey started by the Biden administration to evaluate progress in reopening schools.

The data capture a month that saw building momentum in the push to reopen schools. In February, the Centers for Disease Control and Prevention declared that schools could safely reopen with masks, social distancing and other precautions. Days later, Biden reframed his goal around reopening schools after critics said his previous pledge lacked ambition.

As in January, the new results showed dramatic disparities based on region and race. In the South, slightly more than half of all fourth graders were learning entirely at school in February, an uptick from the month before. In the same period, by contrast, the Northeast saw a decrease in the rate of students learning in the classroom five days a week, from 23% to 19%.

Overall, more than a third of students in the South and Midwest were learning entirely at school, compared with less than a quarter in the West and Northeast, according to the survey.

White students continued to be far more likely to be back in the classroom, with 52% of white fourth graders receiving full-time, in-person instruction. By contrast, less than a third of Black and Hispanic fourth graders were back at school full time, along with just 15% of Asian students.

The survey does not ask whether students are learning remotely by choice or because their schools do not offer an in-person option. But the wide gulf between school offerings and student learning data suggests that at least some students are opting to stay remote even after their schools reopen classrooms.

It matches previous findings from some of the nation’s largest school districts, where Black students have returned at far lower rates than their white classmates — a disparity that’s believed to come down at least partly to trust. Advocates say more must be done to convince parents that their children will be safe in school, especially Black families who have been disproportionately affected by the coronavirus.