Primary Outcome Measure

The primary measurement(s) or observation(s) used to measure the effect of experimental variables in a study, or for observational studies, to describe patterns of diseases or traits or associations with exposures, risk factors or treatment. These are the outcome measures used to assess the primary objective(s). (NCI Thesaurus)

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Primary Oocyte

The primitive differentiated female gamete which gives rise to an oocyte.

Primary Occupation Code

A coded value specifying the principal activity that a person does to earn money.

Primary Neoplasm

A tumor at the original site of origin.

Primary myelofibrosis

A progressive, chronic disease in which the bone marrow is replaced by fibrous tissue and blood is made in organs such as…

Primary Motor Cortex

A brain region that is located in the dorsal part of the precentral gyrus.

Primary Melanocytic Lesion of Meninges

A benign or malignant, circumscribed or diffuse neoplasm that arises from melanocytes in the leptomeninges. It includes diffuse melanocytosis, leptomeningeal melanoma,…