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The Comments (CO) special-purpose domain is used to capture unstructured free-text comments. It allows for the submission of comments related to a particular domain or those collected on separate general-comment log-style pages not associated with a domain. Comments may be related to a subject, a domain for a subject, or to specific parent records in any domain. The CO special-purpose domain is structured similarly to the Supplemental Qualifiers (SUPP--) dataset, in that it uses the same set of keys (STUDYID, RDOMAIN, USUBJID, IDVAR, and IDVARVAL) to identify related records. All comments except those collected on log-style pages not associated with a domain are considered child records of subject data captured in domains. STUDYID, USUBJID (or POOLID), and DOMAIN (with the value CO) must always be populated. RDOMAIN, IDVAR, and IDVARVAL should be populated as follows:

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Additional information may be placed in COREF (e.g., CRF page number or name) to further describe the comment's relationship to the parent record.

For clinical studies only:

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be added to the CO special-purpose domain

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per guidance in the CO domain specification.

As with Supplemental Qualifiers (SUPP--) and Related Records (RELREC), --GRPID and other grouping variables can be used as the value in IDVAR to identify comments with relationships to multiple domain records. The limitation of this is that a single comment may only be related to a group of records in 1 domain (RDOMAIN can have only 1 value). If a single comment relates to records in multiple domains, the comment may need to be repeated in the CO special-purpose domain to facilitate the understanding of the relationships.

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