While the coronavirus pandemic has had a "significant" impact on children and adolescents' mental health, it is "just the tip of the iceberg," says UNICEF.

Young people around the world will see the impact of the COVID pandemic on their mental health for years to come, the UN's children's agency warned on Tuesday.

UNICEF released on Tuesday what it says is its "most comprehensive look at the mental health of children, adolescents and caregivers in the 21st century."

In its report, UNICEF found that, globally, coronavirus restrictions have affected young people's mental health as they spent "indelible" years of their lives away from family, friends and school.

According to the report, at least one in seven young people between the ages 10 and 19 worldwide has been diagnosed with a mental disorder.