RETN and metabolic syndrome: The serum concentration of resistin and AR index values in T2DM participants who developed MetS [315.21 (310.29–319.62) pg/mL; 2.98 (2.97–3.00)] at the end of this study were significantly higher (p = 0.001) compared to the values before the onset of MetS [284.50 (278.93–289.12) pg/mL; 2.85 (2.83–2.86)] (Table 3).