A type of eligibility criteria that indicates whether people who do not have the condition/disease being studied can participate in that clinical study. [ https://clinicaltrials.gov/ct2/about-studies/glossary ]

Indication that participants who do not have a disease or condition, or related conditions or symptoms, under study in the clinical study are permitted to participate in the clinical study. [ https://prsinfo.clinicaltrials.gov/definitions.html ]