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Thirty-day mortality rates in patients treated with an ampicillin- and/or a piperacillin-based regimen stratified according to the MICs of penicillin, imipenem, and ampicillin. Bar charts indicate numbers of patients stratified by the MIC of each antimicrobial. Red rhombi indicate 30-day mortality rates. As MICs of each antimicrobial increase, trends in the 30-day mortality rates are plotted with dotted lines obtained from Pearson’s correlation coefficients.
