Each of the 15 Health Boards in Scotland maintains a computer file of its residents who are registered with a general practitioner; this is known as the Community Health Index or CHI. The CHI allows a variety of demographic data and indicators of health to be analysed on either a geographic or general practice base, or both simultaneously. The considerable potential of the CHI as a public health tool may be of interest to health authorities outside Scotland which are developing wider uses for their own family practitioner registers.
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J Womersley (1996) studied this question.