Postoperative opioid consumption after spine surgery: 24 hours or midnight to midnight?

There is currently no standard timing method used to quantify postoperative opioid consumption. Some studies define postoperative day (POD) 0 as anesthesia stop time until 23:59:59 of the date of surgery and POD 1 as beginning at midnight following the date of surgery (POD@MN).[1][1] While this may