Figure 2.
The association between ibuprofen exposure and postoperative AKI. Three different methods were used to assess the association: (1) multivariable Cox regression with time-varying ibuprofen exposure, (2) the same multivariable Cox regression model with ibuprofen exposure defined as given ibuprofen within 48 h after surgery, (3) propensity score-matching analysis. PSM, propensity-score matching.