Objective: To analyze the discrepancies between clinical and autopsy diagnoses in hospitals of different grades and with respect to duration of hospitalization.

Methods: A total of 188 autopsy cases collected from hospitals of different grades were retrospectively reviewed and the discrepancies between clinical and autopsy diagnoses were analyzed.

Results: The overall rate of misdiagnosis was 48.9% (92/188). The misdiagnosis rate in grade I hospitals (75.8%, 25/33) was significantly higher than that in grade III (39.6%, 38/96; chi(2) = 12.861, P = 0.000) and grade II hospitals (49.2%, 29/59; chi(2) = 6.179, P = 0.016 ). The misdiagnosis rate of patients beyond 24 hours of admission was lower than that admitted within 24 hours (chi(2) = 20.991, P = 0.000). The overall rate of missed diagnosis was 34.6% (65/188). The rate of missed diagnosis in grade I hospitals was remarkably higher than that of the grade III hospitals (chi(2) = 8.241, P = 0.006). There was no difference between grades I and III hospitals on the rate of missed diagnosis within 24 hours of admission, however, this rate was lower in grade III hospitals in comparing with that of grade I hospitals in patients admitted beyond 24 hours (chi(2) = 5.181, P = 0.047). The distribution of disease entities commonly encountered in patients of both misdiagnosis and missed diagnosis were heart problems, infections, arterial diseases and pulmonary embolism.

Conclusions: The rate of discrepancies between clinical and autopsy diagnoses is relatively high. The misdiagnosis and missed diagnosis rate in grade I hospitals was significantly higher than that in grade III hospitals and was closely related with the duration of hospitalization. Autopsy study thus still remains an important measure in clinical audit.

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