Figure 2a: Change in systolic blood pressure during the study period.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 min after spinal anaesthetic administration. Systolic blood pressure decreased from baseline value in all groups during the study period (P<0.001 for test of within-subjects effects), however, there was no difference among the study groups over time (P=0.117 for test of betweensubjects effects). Data presented as mean (SD). BL=baseline; n=n minutes after administration of spinal anaesthetic; PACU=post-anesthesia care unit;D=discharge from PACU.