In reply: We thank Clarke and Mackay and Hughes for their interest and comments. We accept that a sample larger than the 28 000 endoscopies we reported1 would be required to establish the true incidence of death or other catastrophic complications of our sedation service. As the mortality rate is expected to be so low, it would take many years to achieve an adequate sample size. It is even difficult to determine the mortality from endoscopy in Australia, as quantifying all the endoscopies performed is problematic, and the Royal Australian and New Zealand College of Anaesthetists believes that not all deaths occurring from endoscopy are reported to anaesthetic mortality committees.2
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