A measurement based on a report by a non-expert third party of how a person feels or functions in daily life.

A measurement based on a report of observable signs, events or behaviors related to a patient’s health condition by someone other than that patient or a health professional. Generally a parent, caregiver, or someone who observes the patient in daily life. They are particularly useful for patients who cannot report for themselves (e.g., infants or individuals who are cognitively impaired). It does not include medical judgement or interpretation.

Source: BEST Glossary, Fast Facts: Digital Medicine and PCORI