most recent picks the most recently available value. This may in fact be the value on the current episode. For example, given the following case fragment:
01 Jun 02 30 Jun 03 02 Nov 03 HDL 2.0 2.2 1.9 LDL 4.7 3.1 LipidDrug Y
most recent HDL is 1.9
most recent LDL is 3.1
most recent LipidDrug is “Y”