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EDITOR
Hall questions the independence of the two methods we used to
identify doctors working in the NHS and therefore questions the results
obtained by our use of capture-recapture analysis.
1 2
He
assumes that both methods depend on doctors' propensity to respond to
inquiries. They do not.
We identified doctors working in the NHS by using two fundamentally different approaches. In both cases, the starting point was the nominal list of all doctors who qualified in Great Britain in 1988.
The first approach used the questionnaires of the Medical Careers
Research Group sent to all qualifiers regardless of where they were by
1995 (the year of the survey). The information obtained about doctors'
employment in the NHS depended on the doctors' responses. The second
approach used the Department of Health's records, analysed by the
department for the same doctors at the same point in time. These
records are based on information