Class sizes in UK state primary schools are among the highest of any developed country in the world. With 25.8 pupils in the average state school class, only Japan, Korea and Turkey have larger class sizes. The OECD's "Education at a Glance" report – its annual state of the nation assessment of the performance of all its members – also records that the gap between class sizes in state and private schools – at 13 pupils – is larger in the UK than anywhere else in the world.