Research Paper Volume 12, Issue 24 pp 26012—26028

Decreased testosterone secretion index and free testosterone level with multiple symptoms for late-onset hypogonadism identification: a nationwide multicenter study with 5980 aging males in China

Figure 2. Age trend of TT deficiency. TT deficiency was defined with three kinds of standards: TT<8 nmol/L is the standard for TT supplement; <11 nmol/L and <12 nmol/L is the standard for diagnosis of LOH in EMAS study and other studies, respectively. No age trend of the occurrence of TT deficiency defined by any standard was observed.