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Metadataspec
NumVariable PopulationImplementation
1

Observation Start Timing Relative to a Fixed Reference Point


  • Variable --STTPT represents an applicant-defined fixed reference point that characterizes the start of an observation.
    • Allowable values for --STTPT are a description of or the date and/or time of the fixed reference time point. 
  • Variable --STRTPT represents the start of an observation relative to a reference time point represented in --STTPT.
    • Allowable values are that an observation can:
      • Start BEFORE the reference point,
      • Start COINCIDENT with the reference point; or
      • Be UNKNOWN when it started.
2

Observation End Timing Relative to a Fixed Reference Point

  • Variable --ENTPT represents an applicant-defined fixed reference point that characterizes the end of an observation.
    • Allowable values for --ENTPT are a description of or the date and/or time of the fixed reference time point. 
  • Variable --ENRTPT represents the start of an observation relative to a reference time point represented in --ENTPT.
    • Allowable values are that an observation can:
    • End BEFORE the reference point,
    • End COINCIDENT with the reference point,
    • End AFTER the reference point,
    • Be known that it did not end but was ONGOING; or
    • Be UNKNOWN when it ended or if it was ongoing.
3Planned Intervals Relative to a Fixed Reference Point

When instances of an activity are scheduled at planned time intervals relative to a fixed reference point (e.g., an exposure), the following timing variables will be used:

NumVariableDescription of Use
1--TPTREFRepresents a description of the fixed reference point from which the planned observation will be made.
2--RFTDTCRepresents the actual date/time of the value of --TPTREF.
3--ELTM

Represents the planned elapsed time from the fixed timepoint reference to the planned observation.

  • The value of this variable is usually also reflected in the value of variable --TPT.
4--TPTRepresents the label for the time point relative to the value of --TPTREF.
5--TPTNUMRepresents the order of time points represented in --TPT relative to the value of --TPTREF.


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