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Objective: We sought to examine whether the outcomes of patients who receive a surgical procedure on Friday the 13th differ from patients who receive surgery on flanking Fridays.
Background: Numerous studies have demonstrated that increased anxiety from the provider or patient around the time of surgery can lead to worse outcomes. Superstitious patients often express significant concern and anxiety when undergoing a surgical procedure on Friday the 13th.
Methods: A retrospective, population-based cohort study of 19,747 adults undergoing 1 of 25 common surgical procedures on Friday the 13th or flanking control Fridays (Friday the 6th and Friday the 20th) between January 1, 2007, and December 31, 2019, with 1 year of follow-up. The main outcomes included death, readmission, and complications at 30 days (short-term), 90 days (intermediate-term), and 1 year (long-term).
Results: A total of 7,349 (37.2%) underwent surgery on Friday the 13th, and 12,398 (62.8%) underwent surgery on a flanking Friday during the study period. Patient characteristics were similar between the 2 groups. We found no evidence that patients receiving surgery on Friday the 13th group were more likely to experience the composite primary outcome at 30 days [adjusted odds ratio (aOR) = 1.02 (95% CI = 0.94-1.09)], 90 days [aOR = 0.97 (95% CI = 0.90-1.04)], and 1 year [aOR = 0.99 (95% CI = 0.94-1.04)] after surgery.
Conclusion: Patients receiving surgery on Friday the 13th do not appear to fare worse than those treated on ordinary Fridays with respect to the composite outcome.
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http://www.ncbi.nlm.nih.gov/pmc/articles/PMC11175938 | PMC |
http://dx.doi.org/10.1097/AS9.0000000000000375 | DOI Listing |
Acta Orthop
August 2025
Department of Orthopedic Surgery, Elisabeth-TweeSteden ziekenhuis, Tilburg, The Netherlands.
Background And Purpose: There are still strong beliefs in medicine concerning things that bring "bad luck." It is unclear whether a suspicious component size or surgery date is related to "bad luck" in orthopedic surgery. We aimed to examine: (i) if a potentially unlucky femoral stem size 13 in total hip arthroplasty (THA), and (ii) if a possible unlucky surgery date, Friday 13th, in THA and total knee arthroplasty (TKA) have a higher revision rate.
View Article and Find Full Text PDFAm J Emerg Med
June 2025
Section of Emergency Medicine, University of Chicago Medicine, Chicago, IL, United States of America.
J Heart Lung Transplant
May 2025
Division of Cardiovascular Surgery, Hospital of the University of Pennsylvania, Philadelphia, Pennsylvania; Division of Cardiothoracic Surgery, Children's Hospital of Philadelphia, Philadelphia, Pennsylvania. Electronic address:
Background: The effect of Friday the 13th and Full Moons on cardiac transplantation is unknown. We investigated the impact of these superstitious events on recipient and donor qualities, complications, survival, and volume.
Methods: All adult transplants from 2013-2023 in the United Network for Organ Sharing database were retrospectively reviewed.
Ann Surg Open
March 2024
From the Department of Urology, Houston Methodist Hospital, Houston, TX.
Objective: We sought to examine whether the outcomes of patients who receive a surgical procedure on Friday the 13th differ from patients who receive surgery on flanking Fridays.
Background: Numerous studies have demonstrated that increased anxiety from the provider or patient around the time of surgery can lead to worse outcomes. Superstitious patients often express significant concern and anxiety when undergoing a surgical procedure on Friday the 13th.