Statistical Analysis
Statistical analysis was provided by SPSS version 20.0 statistics software package (Statistical Package for the Social Sciences, SPSS Inc., Chicago, IL, USA). Curves and graphs were generated using GraphPad Prism version 5.0 (GraphPad Software, Inc., San Diego, CA). Sample size calculations were performed for mean HbA1c, in the first postoperative year, using a superiority design. Calculations were based on a test of the mean difference between LRYGBP and LRYGBP+FR, assuming a mean of 6.3 and a standard deviation of 1 in LRYGBP, according to previous findings in our department. An In order to evaluate the interaction between different types of surgery (LRYGBP, LRYGBP+FR) and time (preoperatively, 6 months, 12 months), the two-way mixed ANOVA model was used. The same model was applied for evaluating the postprandial response (0,30,60,120 min) for each type of surgery at any time point (preoperatively, 6 months, 12 months).For the comparisons of parameters and area under curve (AUC) levels, Mann-Whitney 