Figure 2. Mean Standardized Prescription Drug and Total Costs per Quarter for Patients Undergoing Adjustable Gastric Banding vs Roux-en-Y Gastric Bypass.

Quarters −2, −1, and 0 were omitted from the analysis and are not shown here because their extreme high values would have made visually interpreting preoperative to postoperative trend and level changes difficult.

^a Refers to the 91.25-day period relative to the index procedure.