Fig. 1

Distribution of piperacillin trough levels over the course of 4 days. Trough levels a for all patients b for patients receiving piperacillin-tazobactam (PIP-TAZ) three times daily, and c for patients receiving PIP-TAZ two times daily because of impaired renal function are shown. Boxplots represent medians and interquartile ranges, and the ends of the whiskers represent the 5th and 95th percentiles