Substance Use Start Relative to Reference Period

A characterization of the relationship of a substance use conclusion beginning point in time to a reference point in time. (NCI Thesaurus)

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Substance Use Start Day

The day of the week substance usage began.

Substance Use Start Date Time

The date and time substance usage began.

Substance Use Sponsor Defined Identifier

One or more sponsor defined characters used to name substance usage data.

Substance Use Sequence

An identifier that describes the relative position of substance use data within a series.

Substance Use Route of Administration

The method a substance was introduced to a subject.

Substance Use Reported Name

The literal identifier of the substance in use.