Fig. 1

Antibiotic regimens assessed in the included studies stratified by bacterial phenotype and number of patients. Legend: The antibiotics belonging to same classes are grouped. Carbapenem classes includes Group A carbapenem (doripenem, imipenem, meropenem). Tigecycline is the only agent belongs to the class of glycyclyine. Sulbactam was grouped separately for Acinetobacter. The computation of patients referred to the outcome mortality (or clinical cure, if mortality was not reported by the individual study). In case of multiple outcomes, the number of patients for each antibiotic regimen was computed for only one outcome. BLBLIs: beta lactam-beta lactam inhibitors