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Related Experiment Videos

Do inaccuracies in small area deprivation analyses matter?

R Reading1, S Openshaw

  • 1Department of Community Paediatrics, Northumberland Health Authority.

Journal of Epidemiology and Community Health
|June 1, 1993
PubMed
Summary

Computerised postcode matching to enumeration districts (EDs) is inaccurate, but minimally impacts small area deprivation studies. Socioeconomic inequalities are slightly blunted, not erased, by this method.

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Area of Science:

  • Public Health
  • Geographic Information Systems
  • Socioeconomic Research

Background:

  • Small area deprivation studies rely on accurate geographic data.
  • Postcode data is often used to approximate enumeration district (ED) information.
  • The accuracy of computerised postcode-to-ED matching is critical for valid socioeconomic analysis.

Purpose of the Study:

  • To evaluate the precision of computerised postcode-to-enumeration district (ED) matching.
  • To assess if postcode-ED mismatches compromise the validity of small area deprivation studies.
  • To determine the impact of inaccurate matching on socioeconomic inequality detection.

Main Methods:

  • Comparison of computerised and manual postcode-to-ED matching.
  • Utilisation of the Townsend deprivation score derived from census data.
  • Analysis of socioeconomic data from individual families in Northumberland, England.

Main Results:

  • Computerised matching achieved only 47% accuracy in postcode-to-ED assignment.
  • Despite inaccuracies, 80% of computer-matched ED deprivation scores were within +/- 2 of the actual score.
  • Computer matching reduced the accurate classification of deprived families from 75% to 56% and affluent families from 4% to 12%.

Conclusions:

  • Computerised postcode-to-ED matching demonstrates significant inaccuracy.
  • The impact of this inaccuracy on the overall allocation of deprivation scores is minimal.
  • While socioeconomic inequalities are somewhat blunted by computerised matching, they remain detectable.

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