DEFINITION : The Comments (CO) domain captures additional free-text comments or clarifications  related  to other records or data points in the study. It is used when further explanation is needed beyond structured data.

PURPOSE : To provide contextual or additional qualitative information that may not be captured in other domains.

STRUCTURE : One record per comment per subject

TOPIC : COVAL

KEY VARIABLES : STUDYID, USUBJID, COSEQ