I (int) subtype:PrThr:Pt:RBC^Donor:Ord
i (int) subtype:prthr:pt:rbc^donor:ord
I (int) subtype:Presence or Threshold:To identify measures at a point in time:Erythrocytes^Donor:Ordinal
i (int) subtype:presence or threshold:to identify measures at a point in time:erythrocytes^donor:ordinal