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Kaplan Meier curve for 30-day survival according to whether a patient was COVID negative (black), COVID positive at admission (red) or COVID positive after admission (grey). Log rank p = 0.661, between COVID positive patients preoperatively (75.1%, 95% CI 69.4 to 80.8) versus postoperatively (71.4%, 95% CI 67.1 to 75.7) at 30-days.
