Figure 1: Total dose of ephedrine required during the study. Group 1=Sitting up for 5 minutes after spinal anaesthetic administration; Group 2=Sitting up for 7 minutes after spinal anaesthetic administration; Group 3=Sitting up for 9 minutes after spinal anaesthetic administration. The solid horizontal line (●)represents the median for all groups, and the circles (ο) represent the total dose administered to either one patient or several superimposed patients.