There are multiple definitions:

1. T-cell exhaustion index(English)

   • a score established by utilizing least absolute shrinkage and selection operator (LASSO) regression
   • HBV, HCC, HGD, LASSO, TAT, TERG, TME, TNM
   • Liver disease, Oncology
   • https://doi.org…885-023-11804-3

2. total enzymatic activity index(English)

   • Environment, Biomarker, Enzymes
   • https://doi.org…pol.2023.123286

3. total energy intake(English)

   • BMI, PL
   • Diet, Metabolism
   • https://doi.org…366-023-01455-6