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Nicholas A Christakis a Department of Medicine, University of Chicago
Medical Center, Chicago, IL 60637, USA, b Robert Wood Johnson Clinical
Scholars Program, University of Chicago Medical Center
Correspondence to:
N A Christakis nchrista{at}medicine.bsd.uchicago.edu
Objective:
To describe doctors' prognostic accuracy
in terminally ill patients and to evaluate the determinants of that accuracy.
Design:
Prospective cohort study.
Setting:
Five outpatient hospice programmes in Chicago.
Participants:
343 doctors provided survival estimates
for 468 terminally ill patients at the time of hospice referral.
Main outcome measures:
Patients' estimated and actual survival.
Results:
Median survival was 24 days. Only 20%
(92/468) of predictions were accurate (within 33% of actual survival); 63% (295/468) were overoptimistic and 17% (81/468) were
overpessimistic. Overall, doctors overestimated survival by a factor of
5.3. Few patient or doctor characteristics were associated with
prognostic accuracy. Male patients were 58% less likely to have
overpessimistic predictions. Non-oncology medical specialists were
326% more likely than general internists to make overpessimistic
predictions. Doctors in the upper quartile of practice
experience were the most accurate. As duration of doctor-patient
relationship increased and time since last contact decreased,
prognostic accuracy decreased.
Conclusion:
Doctors are inaccurate in their prognoses for terminally ill patients and the error is systematically optimistic. The inaccuracy is, in general, not restricted to certain kinds of
doctors or patients. These phenomena may be adversely affecting the
quality of care given to patients near the end of life.
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