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Kaplan–Meier plots showing the probability of survival based on patients’ characteristics. (A) Patients aged less than 70 years (solid line) or older than or equal to 70 years (dashed line). Age showed prognostic significance for survival at a cut-off point set at 70 years (p < 0.0001), with an estimated 28-day survival rate of 67.4% and 21.4%, respectively. (B) Survival was not affected by gender (female, solid line; male, dashed line) (p = 0.086).
