Baseline Characteristics of Surgical Patients Stratified by Prior COVID-19 Infection
Abbreviations: ASA, American Society of Anesthesiologists; BMI, body mass index (calculated as weight in kilograms divided by height in meters squared); NA, not applicable; SMD, standardized mean difference.SI conversion factor: To convert albumin to grams per liter, multiply by 10.0.The “prior” in the column headings is relative to the date of surgery.Factors known at time zero that would be associated with exposure and were considered balanced if SMDs were less than 0.2.COVID-19 vaccine status is on day 60 prior to surgery.Includes Montana, Wyoming, Louisiana, Texas, Missouri, Colorado, Arkansas, Oklahoma, and Utah.