A data frame with 30810 rows and 14 variables
A dataset with variables as follows:
MHDTONSET D Date of onset:
RID N Participant roster ID
SITEID N Site ID
VISCODE T Visit code
USERDATE S Date record created
EXAMDATE D Examination Date
MHNUM N System Number
MHDESC T Description of problem (including date of onset)
MHCUR N Is the problem current?
MHSTAB N If Yes, is the problem stable?
USERDATE2 S Date record last updated