Variation in use – a historical
perspective
n Originate in the phenomenon of practice pattern variations described
by Wennberg and his associates in a continuing series of studies
starting in the mid 70’s
– These papers demonstrated substantial geographical variation in
the aggregate use of physician and hospital services
– And in specific utilization rates of common surgical and radiologic
procedures
– The authors argued that these variations neither reflect an intrinsic
variation in the prevalence of specific conditions, nor are
explained by differing patient preferences,
n What they do represent is still a matter of considerable debate
n Nevertheless appears to be general agreement that such variations are
a symptom of something seriously wrong with our health system
– Which should either be addressed for its own sake or as a way of
controlling health care costs
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