One of the criteria used to calculate Risk Index is operation time. What are some examples of 75th percentile of the duration for surgery?
A risk index point is allocated if an operation lasts more than t hours where t is the 75th percentile of the duration of surgery for that particular operative procedure (rounded to the nearest hour). That is, 75% of the operations for that procedure were shorter than t hours and 25% were longer than t hours.
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