NAMPT and type 2 diabetes mellitus: Effect size analyses revealed very small differences in visfatin levels across the groups (Cohen’s d = −0.16 for Control vs. Non-Obese T2DM; −0.12 for Control vs. Obese T2DM; +0.06 for Non-Obese vs. Obese T2DM), indicating limited clinical relevance despite statistical significance, and non-parametric tests were used to minimize the influence of potential outliers.