Table 4. Risk of end-stage renal disease (ESRD), long-term mortality, and composite endpoints among the four groups categorized by baseline kidney function and post-PCI AKI status.

	AHR for ESRD (95% C.I.)	AHR for death (95% C.I.)	AHR for composite endpoint (95% C.I.)
Group 1	Ref.	Ref.	Ref.
Group 2	0.80 (0.06, 10.72)	1.96 (1.16, 3.32)*	1.92 (1.16, 3.20)*
Group 3	NA	4.36 (1.56, 12.19)#	4.61 (1.66, 12.85)#
Group 4	2.25 (0.12, 43.88)	14.45 (7.15, 29.20)†	12.73 (6.42, 25.24)†

Group 1: baseline eGFR ≥ 45 ml/min/1.73 m² and no AKI following PCI; Group 2: baseline eGFR < 45 ml/min/1.73 m² and no AKI following PCI; Group 3: baseline eGFR ≥ 45 ml/min/1.73 m² and AKI following PCI; Group 4: baseline eGFR < 45 ml/min/1.73 m² and AKI following PCI.

AHR, adjusted hazard ratios; AKI, acute kidney injury; eGFR, estimated glomerular filtration rate; NA, not applicable; PCI, percutaneous coronary intervention; 95% C.I., 95% confidence interval.

* p < 0.05; ^# p < 0.01; ^† p < 0.001.