Kaplan–Meier analysis demonstrated higher one-year survival rates in the late period group compared with the early period group, although it was borderline significance (86.6% ± 0.61% vs. 88.3% ± 0.72%, respectively; log-rank p = 0.081; Figure 3 ).
Our survival analysis revealed a consistency in short-term (in-hospital) mortality across both periods, while demonstrating a favorable trend toward lower one-year mortality in recent years, with multivariable Cox regression confirming that admission during the late period was independently associated with improved survival.