Postcodes as useful markers of income in 26,000 British households.

We previously reported a validation study in 26 000 British residents, showing that postcodes were good indicators of a wide range of household characteristics related to socioeconomic status, including occupation, education, home ownership and access to various consumer goods. That report, however, was too brief to include details of the correlations between postcode estimates and reported household income in potentially relevant subgroups, and therefore it did not describe the data by the sex or age of the head of household, by the geographical region of residence, or by diVerent income levels. As such details might be relevant to epidemiologists and statisticians who use postcode estimates in population based studies, this report provides supplementary data.