borderline significanceP = 0.019
Group 3 maintained the strongest adjusted association with subsequent dialysis initiation (SHR = 7.59, 95% CI: 2.75–20.9, P < 0.001), while Group 5 showed moderate significance (SHR = 3.51, 95% CI: 1.26–9.78, P = 0.016), and Group 1 retained borderline significance (SHR = 3.41, 95% CI: 1.22–9.51, P = 0.019).