NRG4 and type 2 diabetes mellitus: Based on the statistical results from Sections 3.2 and 3.3, Pearson’s correlation coefficient was employed to assess the relationship between NRG4 levels in patients with T2DM combined with FT and various indicators, including FBG, 2hPBG, HbA1c, HOMA-IR, FT3, FT4, TSH, the positive rate of NRG4 in thyroid tissue, thyroid volume, blood flow velocity, and RI (Table 3).