Some interesting points emerge from a careful examination of Table 4. In terms of inter-window efficient units, as can be seen from the contents of the summary column for each group, the following apply: There are nine semi-efficient and two inter-efficient hospitals in group A. In group B, there is only one inter-efficient hospital and three semi-efficient ones. This is also the group with the lowest number of inter-temporal efficient units (i.e. semi-efficient plus inter-efficient). Group C has five semi-efficient hospitals and two inter-efficient ones while in group D there are seven semi-efficient and two inter-efficient units. In terms of inter-window trend (i.e. constantly upward/downward units) there are only three hospitals that appear to be trending always upward. These are hospitals B23, C15 and D23. It should be noticed also that the two smaller groups (A and D) are the ones with the highest number of inter-window efficient units.