Fig. 2. Transformed (square root) Perceived Stress Scale (PSS) scores at the pre-operative assessment in the hospital immediately before surgery (PRE), the first postoperative assessment (day of surgery, POST), the day after surgery (POD2), the following day (POD3), and 1 week after surgery (POD8). Scores for patients undergoing outpatient monitored anesthesia care (MAC), outpatient surgery requiring general or major regional anesthesia (OUTPATIENT), or inpatient procedures (INPATIENT) are shown separately. Values are presented as mean ± SD.