Blood pressure on the first and second visits.
data(Diabetes)
A data frame with 403 rows (one per person) and 4 columns; many values are missing
the systolic blood pressure from the first visit, in mm Hg
the diastolic blood pressure from the first visit, in mm Hg
the systolic blood pressure from the second visit, in mm Hg
the diastolic blood pressure from the second visit, in mm Hg