Substance Usage Start Timepoint

A point in time that indicates the beginning of substance usage. (NCI Thesaurus)

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Substance Usage Start Relative to Reference Timepoint

An indication or description of the start of substance usage in relation to a specific point in time.

Substance Usage Start Date

The date on which the substance usage begins.

Substance Usage Pre-specified

An indication or description that substance usage was previously determined, characterized, or detailed.

Substance Usage End Timepoint

A point in time that indicates the conclusion of substance usage.

Substance Usage End Relative to Reference Time Point

An indicator of the conclusion of substance usage in relation to a specific point in time.

Substance Usage Dictionary Derived Substance Term

A substance usage identifier obtained from a dictionary.