Table 1.

Glossary of PhenX terms

Term	PhenX definition
Collection	A collection of measures with a shared characteristic, target population, or topic. The measures included in a Collection may cut across research domains.
Domain	A field of research with a unifying theme and easily enumerated quantitative and qualitative measures (e.g., demographics, anthropometrics, organ systems, complex diseases, and lifestyle factors).
Measure	A standardized way of capturing data on a certain characteristic of, or relating to a study subject.
Protocol	A standard procedure recommended by a Working Group for investigators to collect and record a PhenX Measure.
Variable	A data element collected by a PhenX protocol.