Uncertainty/variability factor

{
  "id": "MLC-T-ENV-029011",
  "term": "Uncertainty/variability factor",
  "field": "Environment",
  "definition": "One of several, generally 10-fold, default factors used in operationally deriving the RfD and RfC from experimental data. The factors are intended to account for (1) variation in susceptibility among the members of the human population (i.e., inter-individual or intraspecies variability); (2) uncertainty in extrapolating animal data to humans (i.e., interspecies uncertainty); (3) uncertainty in extrapolating from data obtained in a study with less-than-lifetime exposure (i.e., extrapolating from subchronic to chronic exposure); (4) uncertainty in extrapolating from a LOAEL rather than from a NOAEL; and (5) uncertainty associated with extrapolation when the database is incomplete.",
  "abbreviation": "UFs",
  "subject": "Chemicals, toxics and pesticides",
  "references": [
    "Risk Assessment Glossary"
  ],
  "url": "https://mlchart.com/terminology/environment/uncertainty-variability-factor/"
}