In reply: We thank Tracy and Hugh for the issues they raise. The goal of our study was to establish baseline information on the incidence of serious adverse events (SAEs) for use in subsequent intervention studies.1 The data were needed for statistical power calculations. Our inclusion criteria were predefined, as is scientifically orthodox for any study. We chose to study a population of clinical relevance to inpatient medicine. Most simple procedures at our hospital require day admission with no overnight inpatient stay, so these were not relevant to our goals. Others may wish to study different patient populations and are free to do so.
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