In January 2010 the Nuffield Trust published a comparative study of NHS performance in England and the devolved administrations since devolution, concluding that while Scotland, Wales and Northern Ireland have had higher levels of funding per capita than England, with the latter having fewer doctors, nurses and managers per head of population, the English NHS is making better use of the resources by delivering relatively higher levels of activity, crude productivity of its staff, and lower waiting times. However, the Nuffield Trust quickly issued a clarifying statement in which they admitted that the figures they used to make comparisons between Scotland and the rest of the United Kingdom were inaccurate due to the figure for medical staff in Scotland being overestimated by 27 per cent.