Schools with the most-deprived cohorts have spent more of their budget on curriculum resources than schools with medium levels of deprivation, which, in turn, have spent more than schools with low levels of deprivation.
This may be because those schools with higher levels of deprivation make more use of intervention resources to try and close the gap between disadvantaged children and their peers.
It is possible that they also have a higher degree of variation when it comes to attainment, and so need more resources at different levels of attainment than those schools in less deprived areas.