On the contrary, in the subgroup of participants aged 65 years or older, the inverse association between serum TT and presence of prediabetes was observed in model 2 and model 3 (P for trend≤0.01, Table 4), while, after further adjustment for serum SHBG, FT and HOMA-IR, this association was no longer statistically significant (P for trend≥0.05, Table 4, model 4, model 5). Here, SHBG is linked to prediabetes syndrome.