“…As Busby et al 9 reported in the first paper describing the development of this concise survey, these results, from a group of volunteer practices, could not be considered to represent a random sample of UK dentists. They also reported that these patients appeared to perceive broadly favourable outcomes, but that it was possible, by focusing principally on the percentage of 'ideal' scores received, to measure statistically significant differences in perceived performance between practices and between the different aspects covered within a practice.…”