b Doripenem regimen was 500 mg i.v. every 8 hours; unless otherwise noted, the infusion lasted 60 minutes. c 4-hour infusion. d 500 mg i.v. every 6 hours via a 30-minute infusion or 1 g every 8 ...

A factor that could have affected the findings of this meta-analysis is that the total dosage of the antibiotic administered differed between the two treatment groups in most of the studies.