General Guidance for Data Collection Fields

1. CDASH date variables (e.g., --DAT, --STDAT, --ENDAT) are concatenated with CDASH time variables (e.g., --TIM, --STTIM, --ENTIM, if time is applicable) into the appropriate SDTM --DTC variables (e.g., --DTC, --STDTC, --ENDTC) using ISO 8601 format.
2. Collecting the time an intervention was started is only appropriate if it can be realistically determined and if there is a scientific reason for needing to know this level of detail. An example is where the subject is under the direct care of the site at the time the intervention was started, and the study design is such that it is important to know the intervention start time with respect to dosing.

1. When free-text intervention treatments are recorded, the location may be included in the --TRT variable to facilitate coding (e.g., liver biopsy). Location may be collected when the sponsor needs to identify the specific anatomical location of the intervention. This location information does not need to be removed from the verbatim --TRT when creating SDTMIG submission datasets.
2. The non-standard (or SUPPQUAL) variables --ATC1 through --ATC5 and --ATC1CD through --ATC5CD are used only when the intervention is coded using the World Health Organization's Anatomical Therapeutic Chemical (ATC) classification system (https://www.who.int/medicines/regulation/): 1 = the anatomical main group, 2 = the therapeutic main group, 3 = the therapeutic/pharmacological subgroup, 4 = chemical/therapeutic/pharmacological subgroup, 5 = chemical substance.
3. The implementer may also add MedDRA coding elements as NSVs to the Interventions domain if this dictionary is used for coding.

1. Because the complete lists of controlled terminology for these variables may be too extensive to be relevant for a particular study CRF, sponsors may choose to include only subsets of the controlled terminology on the CRF.
2. --LOC could be a defaulted or hidden field on the CRF for prespecified [--TRT]/Intervention Topic].

1. For each study, the sponsor defines the study reference period in the Demographics (DM) domain using SDTMIG variables RFSTDTC and RFENDTC. Other sponsor-specified reference time points can be defined for other data collection situations. The CDASH variables --PRIOR and --ONGO may be collected in lieu of start date or end date.
2. The CDASH variable --PRIOR is used to indicate if the --TRT (the topic item) started prior to either the study reference period or another sponsor-defined reference time point. When the study reference period is used as the anchor, --PRIOR may be used to derive a value (from the Controlled Terminology codelist STENRF) into the SDTM relative timing variable --STRF. When populating --STRF, if the value of --PRIOR is "Y", the value of “BEFORE” may be mapped to --STRF. The value in DM.RFSTDTC serves as the anchor for --STRF. 
3. When a reference time point is used instead of the study reference period, --PRIOR may be used to derive a value into the SDTM relative timing variable --STRTPT. If the value of --PRIOR is "Y", the value of "BEFORE" may be derived into --STRTPT. Note: --STRTPT must refer to the "time point anchor" as described in --STTPT. The value in --STTPT can be either text (e.g., "VISIT 1") or a date (in ISO 8601 format).
4. The CDASH variable --ONGO is used to indicate if the value in --TRT is continuing beyond the study reference period or beyond another sponsor-defined reference time point. When the study reference period is used as the anchor, --ONGO may be used to derive a value into the SDTM relative timing variable --ENRF. If the value of --ONGO = "Y", the value of "AFTER" may be mapped to --ENRF. 
5. When a reference time point is used instead of the study reference period, --ONGO may be used to derive a value into the SDTM relative timing variable --ENRTPT. If the value of --ONGO is "Y", the value of "ONGOING" may be mapped to --ENRTPT. Note: --ENRTPT must refer to the “time point anchor” as described in --ENTPT. The value in --ENTPT can be either text (e.g., "TRIAL EXIT") or a date (in ISO 8601 format).

Variables with the question text "Were there any <events>?" (e.g., “Were there any adverse events?”, “Were there any healthcare encounters?”) are intended to assist in the cleaning of data and in confirming there are no missing values. These questions can be added to any CRF in order to capture this information.

• CDASH date variables (e.g., --DAT, --STDAT,--ENDAT) are concatenated with CDASH time variables (e.g., --TIM, --STTIM, --ENTIM, if time is collected) into the appropriate SDTM --DTC variables (e.g., --DTC, --STDTC, --ENDTC) using ISO 8601 format.
• Collecting the time of an event is only appropriate if it can be easily obtained and if there is a scientific reason, such as the need to know the order of events (e.g., the adverse event started after dosing). An example of this would be a study where the subject is confined to a phase 1 unit and under the direct care of the unit staff at the time that the event started or using time to tie together dosing and pharmacokinetic (PK) sample collection.

1. The CDASH variables used for coding are not data collection fields that will appear on the CRF itself. Sponsors will populate these through the coding process.
2. When free-text event terms are entered, the location may be included in --TERM to facilitate coding and further clarify the event. This location information does not need to be removed from the verbatim term when creating SDTM submission datasets.
3. The CDASH variables --LLT, --LLTCD, --PTCD, --HLT, --HLTCD, --HLGT, --HLGTCD, --SOC, and --SOCCD are only applicable to events coded in MedDRA.

1. Location is collected when the sponsor needs to identify the specific anatomical location of the event.
2. Implementers may collect the location information using a subset list of controlled terminology on the CRF. Location variables can be prepopulated as needed. There is currently some overlap across the LOC, LAT, and DIR variables for controlled terminology. While the overlap exists, ensure that this overlap for these variables is not part of database design. 

defines - variables to record whether an assessment has been performed/collected. --REASND is used to collect a reason why an assessment was not done.

1. a. --PERF variable has the Question Text "[Were any/Was the] [--TEST/ topic] [measurement(s)/test(s) /examinations (s)/specimen(s) /sample(s) ] [performed/collected]?" are intended to assist in the cleaning of data and in confirming that there are no missing values.

   b. --PERF may be used at the page, panel, or question level. --PERF may be used during the creation of the STDM submission datasets to derive a value into the SDTM variable --STAT. The implementer can use a combination of --CAT, --SCAT, with the --TESTCD= "--ALL" and --TEST= "<Name of the CRF module>" to represent what tests were not performed. Refer to the current SDTMIG for more information.

   1. The CRF examples typically include generic mapping instruction for --PERF variables. Sponsors must decide how to model each test not performed (e.g., to denote that all tests were not performed using TESTCD = "–ALL"). For example, Ophthalmic Examinations (OE) CRF examples illustrate the use of OETESTCD = "OEALL".  See Section 8.3.19, OE - Ophthalmic Examinations. 

   c. --STAT variable has the Question Text "Was the [--TEST ] not [completed/answered/done/assessed/evaluated]?; Indicate if (the [--TEST] was) not [answered/assessed/done/evaluated/performed]." This is intended to be used to collect a simple "NOT DONE" check box at the page, panel, or question level. 

   d. The CDASH variable --REASND is used with SDTM variable --STAT only. The value NOT DONE in --STAT indicates that the findings test was not performed. 

1. CDASH variables (--DAT, --TIM) are used in Findings domains to collect the date or date and time that the test was done or performed. The SDTM --DTC variable contains either a date or date and time when a specimen is collected or the start date or start date and time when a specimen is collected over time.
2. Collecting the time is only appropriate if it can be realistically determined and if there is a scientific reason for needing to know this level of detail. An example is where the subject is under the direct care of the site at the time the test was performed and the study design is such that it is important to know the time the test was performed with respect to dosing time. The metadata tables typically only include --DAT but --TIM can be added, when appropriate.     
3. Implementers must not use these elements to record a date that is the result of a test (e.g., date of last day on the job, which would be recorded in the CDASH variable --ORRES). See SDTMIG for more information.
4. The date of collection of a test may be derived from the date of visit. If so, a separate date of observation field is not required to be present on the CRF.

1. In the CDASHIG metadata tables, many of the CDASH Findings class domains are presented in a normalized structure (1 record for each test) that is similar to the SDTM, even though many data management systems hold the data in a denormalized structure (1 variable for each test). When implementing CDASH in a denormalized structure, create variable names for the Findings --TEST and/or --TESTCD values. To do this, define the denormalized variable names using available CDISC Controlled Terminology for --TESTCD. Alternatively, CDASH variable names for data management systems allowing more than 8-character variable names can use CDASH variables using the following naming convention: <--TESTCD>_<-- SDTM variable name> where --TESTCD is the appropriate CT for the test code (e.g., DIABP_VSORRES, DIABP_VSLOC). Other naming convention may be used. See the CRFs in Section 8.3.18, Vital Signs, for examples of CDASH variable naming conventions.   
2. In the horizontal (denormalized) setting, SDTM variables such as --PERF, --LOC , --STAT may be collected once for the whole horizontal record and applying the value to all of the observations on that record, or they can be collected per test using the CDASH variable such as <--TESTCD>_--PERF. When SDTM submission datasets are created, any variables collected for the entire horizontal record must be mapped to each vertical record (as appropriate).
3. In the horizontal (denormalized) setting, an identifier (e.g., --GRPID) may be used to identify all --TESTCD collected on the same record. This facilitates transformation from the CDASH horizontal setting to the SDTM vertical setting and creation of RELRECs.