Abstract
The idea of the ‘district number’ for medical records and information systems is outlined and the problem of ensuring that one, and only one, number is allocated to each individual discussed. The reliability of an existing district general hospital unit record system and of a method of automatic numbering proposed by a government working party are estimated by comparison with the probability match procedure used for the Oxford Record Linkage Study. The reliability of the unit record system is shown to be lower than that of the Oxford linked record system and that of the government working party is unacceptably low. The reasons for low reliability are examined and it is concluded that the Oxford record matching procedure has been developed to an adequate standard to be recommended for use in automated master index systems.
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