Table 5. Hazard ratio for mortality according to renal recovery status (N = 4,733, AKI and renal recovery as time varying covariate).

	6-month mortality	12-month mortality
No of event (%)	1905(40.2%)	2235(47.2%)
No AKI	1[reference]	1[reference]
AKI recovered	2.1(1.8, 2.45)	1.79(1.57, 2.06)
AKI not recovered	6.34(5.54, 7.26)	4.61(4.07, 5.24)
AKI recovery unknown	3.86(3.42, 4.35)	3.64(3.23, 4.09)

Model was adjusted for age, gender, comorbid disease(MI, PVD, CEVD, CHF, diabetes uncomplicated/complicated, cancer, COPD, DEMENTIA, AIDS/HIV, metastatic carcinoma, paraplegia and hemiplegia, peptic ulcer disease, connective tissue disease, and rheumatic disease), paracentesis and esophageal varices with bleeding during hospitalization, and baseline kidney function(baseline eGFR).Follow-up started from hospital admission date for all participants. AKI episodes and renal recovery were treated as a time-varying exposure.