Attainment and adjustment in two geographical areas. II--The prevalence of specific reading retardation.

Specific reading retardation was found to occur in a minimum of 9-9 per cent of ten-year-old 'indigenous' children in one inner London borough. This rate was nearly three times that (3-9 per cent) in Isle of Wight children. There was a comparably higher rate of general reading backwardness in London (19-0 per cent vs 8-3 per cent). Since the same epidemiological methods were followed in the two areas, and since the reading-retarded children had similar psychological characteristics in both cases, it is concluded that there is a real difference between London and the Isle of Wight in the prevalence of reading retardation and of reading backwardness.