Elective general surgery appears to be comparably safe at any time of the workday, any day of the workweek, and in any month of the year. The binary outcomes of 32,001 elective general surgical patients at the Cleveland Clinic between January 2005 and September 2010 were analyzed according to the hour of the day (6 am to 7 pm), day of the workweek, month of the year, and moon phase in which the surgery started.

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