First of these reasons is surgeon work rate. Participation of a resident physicians can also increase operation time with a subsequence of cost increase. A small part of time variation could be due to anesthesiology work. Slight time variations caused by anesthesia could be due to individual differences between anesthesiologists, performing different types of surgery in one day, training residents or covering more than one room. However, these factors can only delay the operation time for only few minutes.
First of these reasons is surgeon work rate. Participation of a resident physicians can also increase operation time with a subsequence of cost increase. A small part of time variation could be due to anesthesiology work. Slight time variations caused by anesthesia could be due to individual differences between anesthesiologists, performing different types of surgery in one day, training residents or covering more than one room. However, these factors can only delay the operation time for only few minutes.