The first official figures for school attendance in England for the autumn term show 88% of pupils went back.
This is a higher absence rate than the usual figure of about 5% but it is not broken down to show whether pupils were at home because of Covid outbreaks.
The figures show attendance last Thursday - but about a quarter of schools did not supply information.
Since the reopening, school leaders have warned that delays in testing are leading to year groups being sent home.
Read more in BBC News
Michaela school wins High Court battle over prayer ban
A High Court judge has ruled any disadvantage to Muslim pupils caused by a prayer ban at Michaela Community School was “outweighed by the aims
Children excluded in primary school less likely to pass GCSEs, new research warns
The majority of children excluded in primary school don’t pass their GCSEs in English and Maths, according to new research. The charity Chance UK looked
Revealed: hundreds of vulnerable children sent to illegal and unregulated care homes in England
Hundreds of extremely vulnerable school-age children in England are being sent to illegal, unregulated homes every year because of a chronic shortage of places in secure local
