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General practice population registers are important sampling frames for surveys of disease prevalence, lifestyles and health needs. In any survey there is a problem of non-response in the target population which can reduce precision and may bias any estimates derived from the study. Bias related to those who choose not to respond has been studied, but the problems posed by those who no longer live at the address on the register have received less attention. The specific objectives of this study were to estimate the number of non-responders in a registered general practice population who had not received a questionnaire ('ghosts') as distinct from those who chose not to respond to it ('refusers') and to determine whether ghosts and refusers were different from non-responders in ways which might affect the purpose of the survey.

Surveys using general practice registers: who are the non-responders?