On occasion the mapping from CDASH to SDTM is complex. This article provides a step-by-step explanation to help follow the iteration from the CDASH example to the SDTM example.
The QNAM values that appear in various examples published in the SDTMIG and TAUGs have sometimes included the domain code, and sometimes not.
In SDTMIG v3.4 and SDTM v2.0, formats for Date/Time variables are now specified as "ISO 8601 datetime or interval." You may ask “What's that interval format and when would I use it?”
In an events or interventions domain, the variable --PRESP = "Y" can be used to indicate that the value in the topic variable (--TERM or --TRT) was pre-specified. However, --PRESP is not a variable that is allowed in findings domains.
In some cases, the reason for the restriction is fairly obvious, but in other cases, understanding the reason requires understanding the differences between how human clinical trials and nonclinical trials are conducted.
CDISC has published the first of a new kind of QRS supplement to the SDTMIG, a supplement for an oncology response criterion, Response Evaluation Criteria in Solid Tumors Version 1.1 (RECIST 1.1).
This article provides information on the ISO international standard for country codes is ISO-3166, which provides several representations of names for countries (ISO-3166-1) and their subdivisions (ISO-3166-2).
For human clinical trials, there is a growing movement to replace the term "study subject" with a terminology that is more respectful and recognizes the agency of those who consent to be treated and have their data collected. The term "participant”, rather than "study subject", is now used in ICH E6 R3 guidelines. The TransCelerate Biopharma Common Protocol Template states that "participant" may be used in patient-facing documents.
SDTM describes several types of datasets. This diagram illustrates hierarchical view of these types of datasets. Findings may be findings about a study subject or about an associated person. A finding record can be linked to supplemental qualifiers, to comments, or to other records via relationships represented in RELREC.
A query about adverse events is, at heart, an observation. Data on the adverse event may also include location and pattern. This concept map includes those details, as well as terminology that would be used in SDTM.
A substance administration consists of a substance and the activity of administering the substance. Some data items describe the substance, others the administration.
This is an example for the familiar test Temperature.
If data is collected in a log form, and if you know the range of dates or visits for collection of log data then The date or visit at which the log is initiated can be used to populate STTPT and CDASH PRIOR or ONGO can be used to populate STRTPT, The date or visit at which the log is finalized can be used to populate ENTPT and CDASH PRIOR or ONGO can be used to populate ENRTPT. STRF and ENRF are not needed and should not be used.
In ordinary conversation, depending on what “that” is, the question, “When did that happen?” could be answered in many ways. The fact that there are so many ways to say when something happened helps to explain why there are so many timing variables in SDTM.