The performance of the National Health Service is assessed in part by
an Efficiency Index (EI) which is applied to the service as a whole as
well as to individual health authorities. The EI relates increases in
the amount of patient care activity to increases in total expenditure
. The index can give a misleading impression of performance, creates p
erverse incentives and is at odds with the overall strategy of the hea
lth service which is to place greater emphasis on the promotion of hea
lth and to provide more care in primary and community-based settings.
The philosophy, validity and appropriateness of the EI are discussed.