A Cox model was used to assess the impact of AKI duration on 28-day ICU mortality, with adjustment on the worst value of the confounding risk factors during the first 3 days of ICU stay for patients with persistent AKI and before renal recovery for patients with transient AKI. Last, ...
ICD-10 diagnosis and procedure codes and CPT codes from the index hospitalization and prior 365 days defined chronic comorbidities including hypertension, chronic kidney disease (CKD) (overall and by stage) (Supplemental Table 3), and Deyo-modified Charlson Comorbidity Index (CCI) [30,31] ...