Four percent of patients died, and 46% had a complication. Two thirds of the patients waited 48 or more hours for surgery, usually because operating rooms were not available or the patient had an acute medical condition. Longer delays were associated with higher death rates and more complications, but when the researchers adjusted their results for acute medical conditions, these associations became very small and may not really exist. The exception was the association between longer delays to surgery and urinary tract infections, which remained after adjustment.