sdtm_sv.RdSubject Visits data frame - One record per actual visit per subject
sdtm_sva data frame with 3559 rows and 8 columns. See https://github.com/SafetyGraphics/safetyData/blob/main/data-raw/sdtm/README.md for more details and full data specification. Columns:
STUDYID text - Study Identifier
DOMAIN text - Domain Abbreviation
USUBJID text - Unique Subject Identifier
VISITNUM float - Visit Number
VISIT text - Visit Name
VISITDY integer - Planned Study Day of Visit
SVSTDTC date - Start Date/Time of Visit
SVENDTC date - End Date/Time of Visit