Control

{
  "id": "MLC-T-ENV-006506",
  "term": "Control",
  "field": "Environment",
  "definition": "1. A treatment in a toxicity test that duplicates all the conditions of the exposure treatments but contains no test material. The control is used to determine the response rate expected in the test organisms in the absence of the test material.\n\n2. The treatment in a toxicity test or other experiment in which the test chemical or other experimental condition is absent. Reference implies comparison without control. Thus reference, rather than control is the appropriate term for observational studies.\n\n3. In a case-control study, comparison group of persons without disease.\n\n4. Ownership of 50 percent or more of a company's voting stock or other equity rights, or the power to control the management and policies of that company. A company may own or control one or more sites. A company may be owned or controlled by a foreign or domestic parent company.",
  "subject": "Policy and guidance",
  "references": [
    "Waste and Cleanup Risk Assessment Glossary",
    "CADDIS Glossary",
    "CDC 2005",
    "40 CFR 704.3 (CFR 2013)"
  ],
  "url": "https://mlchart.com/terminology/environment/control/"
}