SDTM.SE

Variable_order	Dataset_name	Variable_name	Variable_label	Type	Codelist	Role	Core	CDISC_notes
1	SE	STUDYID	Study Identifier	Char		Identifier	Req	Unique identifier for a study.
2	SE	DOMAIN	Domain Abbreviation	Char		Identifier	Req	Two-character abbreviation for the domain.
3	SE	USUBJID	Unique Subject Identifier	Char		Identifier	Req	Identifier used to uniquely identify a subject across all studies for all applications or submissions involving the product.
4	SE	SESEQ	Sequence Number	Num		Identifier	Req	Sequence Number given to ensure uniqueness of subject records within a domain. Should be assigned to be consistent chronological order.
5	SE	ETCD	Element Code	Char		Topic	Req	1. ETCD (the companion to ELEMENT) is limited to 8 characters and does not have special character restrictions. These values should be short for ease of use in programming, but it is not expected that ETCD will need to serve as a variable name. 2. If an encountered Element differs from the planned Element to the point that it is considered a new Element, then use "UNPLAN" as the value for ETCD to represent this Element.
6	SE	ELEMENT	Description of Element	Char		Synonym Qualifier	Perm	The name of the Element. If ETCD has a value of "UNPLAN" then ELEMENT should be Null.
7	SE	SESTDTC	Start Date/Time of Element	Char	ISO 8601	Timing	Req	Start date/time for an Element for each subject.
8	SE	SEENDTC	End Date/Time of Element	Char	ISO 8601	Timing	Exp	End date/time for an Element for each subject.
9	SE	TAETORD	Planned Order of Element within Arm	Num		Timing	Perm	Number that gives the planned order of the Element within the subject's assigned ARM.
10	SE	EPOCH	Epoch	Char	C99079	Timing	Perm	Epoch associated with the Element in the planned sequence of Elements for the ARM to which the subject was assigned
11	SE	SEUPDES	Description of Unplanned Element	Char		Synonym Qualifier	Perm	Description of what happened to the subject during this unplanned Element. Used only if ETCD has the value of "UNPLAN".