sdtm_sc.RdSubject Characteristics data frame - One record per characteristic per subject
sdtm_sca data frame with 254 rows and 14 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
 SCSEQ integer - Sequence Number
 SCTESTCD text - Subject Characteristic Short Name
 SCTEST text - Subject Characteristic
 SCCAT text - Category for Subject Characteristic
 SCORRES text - Result or Finding in Original Units
 SCORRESU text - Original Units
 SCSTRESC text - Character Result/Finding in Std Format
 SCSTRESN integer - Numeric Result/Finding in Standard Units
 SCSTRESU text - Standard Units
 SCDTC date - Date/Time of Collection
 SCDY integer - Study Day of Examination