Table 7.
Renal recovery among survivors at 90 days after peak serum creatinine (weighted cohort)
| Variable | COVID-19–positive W = 441 |
No. nonmissing | Influenza-positive W = 478 |
No. nonmissing | P value |
|---|---|---|---|---|---|
| AKI recovery within 20% baseline serum creatinine within 90 days, n (%)a,b | 402 (91) | 441 | 430 (90) | 478 | 0.494 |
| Stage 1 | 325 (95) | 343 | 372 (92) | 404 | 0.111 |
| Stage 2 | 51 (79) | 65 | 42 (77) | 55 | 0.826 |
| Stage 3 without dialysis | 25 (77) | 33 | 15 (78) | 19 | 0.908 |
AKI, acute kidney injury; COVID-19, coronavirus disease 2019; W, sum of the patient weights.
The W value can be thought of as the effective number of patients in the weighted cohort created by the matching weights. The entire cohort of 1824 patients with AKI who survived 90 days after peak serum creatinine was used with patients receiving weights greater than 0 and less than or equal to 1, yielding a sum of weights equal to 1169.
Restricted to patients who survived 90 days after peak serum creatinine, patients with preadmission baseline serum creatinine, patients with peak serum creatinine occurring at least 90 days before end of data acquisition, and patients who did not require dialysis.
Recovery rates stratified by AKI stage and COVID-19 versus influenza diagnosis.