Polyzogopoulou et al. (A-36) report the effects of bariatric surgery on fasting glucose levels (mmol/L)

on 12 obese subjects with type 2 diabetes at four points in time: pre-operation, at 3 months, 6 months, and 12 months. Can we conclude, after eliminating subject effects, that fasting glucose levels differ over time after surgery? Let a ¼ :05.

Subject No. Pre-op 3 Months 6 Months 12 Months 1 108.0 200.0 94.3 92.0 2 96.7 119.0 84.0 93.0 3 77.0 130.0 76.0 74.0 4 92.0 181.0 82.5 80.5 5 97.0 134.0 81.0 76.0 6 94.0 163.0 96.0 71.0 7 76.0 125.0 74.0 75.5 8 100.0 189.0 97.0 88.5 9 82.0 282.0 91.0 93.0 10 103.5 226.0 86.0 80.5 11 85.5 145.0 83.5 83.0 12 74.5 156.0 71.0 87.0 Source: Data provided courtesy of Theodore K. Alexandrides, M.D.