Nearly one in five children – around 764,000 pupils in England and Wales – experienced some form of online bullying in the year before the coronavirus lockdown, a report suggests.

Being called names, sworn at or insulted was the most common form of cyberbullying among children aged 10 to 15, the Office for National Statistics (ONS) found.

The prevalence of online bullying was significantly higher for children with a long-term illness or disability (26%) than those without (18%), the report says.

The research, based on data from the 10 to 15-year-olds’ Crime Survey for England and Wales (CSEW), looks at online bullying behaviour in the 12 months prior to March this year when the lockdown began.

Researchers suggest the split between in-person and online bullying is likely to have changed substantially in the period after data was collected due to isolation at home and more time spent online.

Children’s isolation at home and increased time spent on the internet is likely to have had a substantial impact on the split between real world and cyberbullying

Overall, 19% of children aged 10 to 15 years in England and Wales experienced at least one type of online bullying behaviour in the year ending March 2020 – the equivalent of 764,000 children.

Nearly three out of four (72%) children who had experienced an online bullying behaviour experienced at least some of it at school or during school time.

More than two in three (68%) believed that their school dealt with bullying well, while a quarter (25%) believed that their school did not deal with bullying well, the report found.

In the survey, children were first asked to identify any nasty things that had happened to them or been done to them from a list of behaviours commonly recognised as bullying.

Children were later separately asked whether or not they would describe the experiences as “bullying”.

More than half (52%) of children who experienced online bullying behaviours said they would not describe it as bullying, while more than one in four (26%) did not report their experiences to anyone.

The majority (68%) of children were emotionally affected by their experience of online bullying, it found.

Sophie Sanders, from the ONS Centre for Crime and Justice, said: “Greater use of smartphones, social media and networking applications means online bullying can follow a child anywhere they go.

“Using new data from the crime survey we can see that around one in five children between the ages of 10 to 15 had experienced some form of online bullying in the previous 12 months.

“This compares with two in five children who experienced bullying in person, and whilst these data were collected before the coronavirus pandemic, children’s isolation at home and increased time spent on the internet is likely to have had a substantial impact on the split between real world and cyberbullying.”

An NSPCC spokesperson said: “These findings are deeply concerning and echo what our Childline counsellors hear on a daily basis. We know online bullying is incredibly traumatic for young people and that it can feel impossible to escape.

“Lockdown has exacerbated these feelings and from April to October our trained counsellors held more than a thousand counselling sessions with young people about online bullying.”