The accuracy of general practitioner records of smoking and alcohol use: comparison with patient questionnaires.
BACKGROUND: General practitioner (GP) records are increasingly being used as sources of information on potential confounders such as smoking use and alcohol intake in epidemiological studies. The aim of this study was to assess the accuracy of GP records on smoking use and alcohol intake compared with data from patient questionnaires. METHODS: Patients registered with 42 practices in Oxfordshire that agreed to take part in a post-marketing surveillance study of omeprazole were sent a postal q...Expand abstract
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