It's reckoned that around one per cent of all children in the UK have the disease, say researchers from the Health Improvement Network.
The greatest increase has been seen among girls under the age of 18, where rates have doubled between 1993 and 2012. There has been a 39 per cent increase in diagnoses among boys.
There was also a stark difference between socio-economic groups. Those from a more deprived background were only half as likely to be diagnosed. The researchers can't explain the disparity, but believe it could be because those from wealthier families are more likely to have the disease diagnosed.
(Source: Archives of Disease in Childhood, 2015: doi: 10.1136/archdischild-2014-307105)