For flag variables, values of only "Y" or null are used when a value of "N" is unimportant to the analysis (i.e., "N" and null are treated the same in the analysis). Flag values of "Y", "N", or null should be used when "N" and null are treated differently in the analysis. The values shown in the Codelist/Controlled Terms column support common statistical needs. If required, the codelist/controlled terms values can be changed from "Y" to "Y, N".
Variable Name | Variable Label | Type | Codelist/ Controlled Terms | Core | CDISC Notes |
ABLFL | Baseline Record Flag | Char | Y | Cond | Character indicator to identify the baseline record for each subject, parameter, and baseline type (BASETYPE) combination. See Analysis Parameter Variables for BDS Datasets. ABLFL is required if BASE is present in the dataset. A baseline record may be derived (e.g., it may be an average), in which case DTYPE must also be populated. If BASE is populated for a parameter, and BASE is non-null for a subject for that parameter, then there must be a record flagged by ABLFL for that subject and parameter. |
ABLFN | Baseline Record Flag (N) | Num | 1 | Perm | Numeric representation of ABLFL. There must be a one-to-one relationship between ABLFN and ABLFL. ABLFN cannot be present unless ABLFL is also present. When ABLFL and ABLFN are present, then on a given record, either both must be populated or both must be null. |
ANLzzFL | Analysis Flag zz | Char | Y | Cond | as SITEGRy, and others. The lower-case letter "zz" in the variable name is an index for the zzth record selection algorithm where "zz" is replaced with a zero-padded two-digit integer [01-99]. Every record selection algorithm "zz" (i.e., every algorithm for populating an ANLzzFL) must be defined in variable metadata. When the set of records that the algorithm "zz" operates on is pre-filtered by application of other criteria, such as a record-level population flag, then the selection algorithm definition in the metadata must so specify. Note that the ANLzzFL value of Y indicates that the record fulfilled the requirements of the algorithm, but does not necessarily imply that the record was actually used in one or more analyses, as whether or not a record is used also depends on the other selection variables applied. The ANLzzFL flag is useful in many circumstances; an example is when there is more than one record for an analysis timepoint within a subject and parameter, as it can be used to identify the record chosen to represent the timepoint for an analysis. "zz" is an index for a record selection algorithm, such as "record closest to target relative day for the AVISIT, with ties broken by the latest record, for each AVISIT within <list of AVISITS>." Note that it is not required that a specific ANLzzFL variable has the same definition across a project or even across datasets within a study. There is also no requirement that the ANLzzFL variables in a dataset or study be used in numerical order; e.g. ANL02FL might occur in a dataset or study without ANL01FL present in the same dataset or study. |
ANLzzFN | Analysis Flag zz (N) | Num | 1 | Perm | Numeric representation of ANLzzFL. There must be a one-to-one relationship between ANLzzFN and ANLzzFL within a dataset. ANLzzFN cannot be present unless ANLzzFL is also present. When ANLzzFL and ANLzzFN are present, then on a given record, either both must be populated or both must be null. |
ONTRTFL | On Product Record Flag | Char | Y | Perm | Character indicator of whether the observation occurred while the subject was on product. ONTRTFL is producer-defined, and its definition may vary across datasets in a study based on analysis needs. |
ONTRTFN | On Product Record Flag (N) | Num | 1 | Perm | Numeric representation of ONTRTFL. There must be a one-to-one relationship between ONTRTFN and ONTRTFL within a dataset. ONTRTFN cannot be present unless ONTRTFL is also present. When ONTRTFL and ONTRTFN are present, then on a given record, either both must be populated or both must be null. |
LVOTFL | Last Value On Product Record Flag | Char | Y | Perm | Character indicator of the subject's last non-missing value on product for each parameter. |
LVOTFN | Last Value On Product Record Flag (N) | Num | 1 | Perm | Numeric representation of LVOTFL. There must be a one-to-one relationship between LVOTFN and LVOTFL within a dataset. LVOTFN cannot be present unless LVOTFL is also present. When LVOTFL and LVOTFN are present, then on a given record, either both must be populated or both must be null. |
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