The<unk> , abbreviated as<unk> , is the calculation of the gonad mass as a proportion of the total body mass. It is represented by the formula:<unk>  = gonad weight / total tissue weight × 100 It is a tool for measuring the sexual maturity of animals in correlation to ovary development and testes development. The index is frequently used as reporting point in OECD test guideline, which may be used as indication or evidence of potential endocrine disruption effect of chemicals in regulatory framework (EFSA and ECHA, 2017).
Gonadosomatic index
Free androgen index
Tanner scale
Testosterone-cortisol ratio
Jostel's TSH index
Insulin index
Thyroid hormone binding ratio
Horowitz index