Up to 60,000 young people, mostly male, may be stabbed and injured each year, the equivalent of more than 160 victims a day, according to a worst-case estimate for knife violence in England and Wales.
On the other hand, the figure may be around 22,000 each year for victims aged 10 - 25-year-old.
The different between the two estimates - derived from the questioning of around 600 under-25s about whether they had been "knifed or stabbed", and then extrapolated to the wider population, with all the statistical vagaries that entails - reflects the lack of precise information about the scale of knife crime in England and Wales.