1. Key Independent Variable: Insurance type (Commercial, Medicaid), preoperative usual prescriber (for appropriate models); postoperative return to usual prescriber within 30 days (for appropriate models)
2. Demographics (Age, sex, race/ethnicity)
3. Comorbidities (Tobacco use, cancer, BMI, ASA class)
4. Clinical characteristics (Surgery priority – elective vs emergent/urgent, inpatient vs outpatient)
5. Procedure: Laparoscopic cholecystectomy, Appendectomy, Minor hernia repair (open/laparoscopic), Vaginal hysterectomy, minimally invasive hysterectomy, Open ventral/incisional hernia repair, Laparoscopic/open colectomy, Abdominal hysterectomy
6. Binary variable for discharge during COVID (Mar 11, 2020 – Dec 15, 2020)