Onset and duration time of sensory and motor block Group Time Time of sensory and motor block (minutes) (min - max) p Group B (n = 54) Group BD (n = 54) Onset of sensory block 17.1 8.3 (7 - 44) 11.1 4.6 (3 - 20) < 0.05 Duration of sensory block 486.6 206.2 (190 - 1035) 824.5 244.8 (305 - 1630) < 0.05 Onset of motor block grade 1 18.7 6.3 (8 - 33) 12.2 5.3 (4 - 28) > 0.05 Onset of motor block grade 2 31.1 8.7 (12 - 46) 19.6 6.0 (10 - 34) < 0.05 Duration of motor block 417.7 199.3 (140 - 910) 800.5 248.9 (180 - 1530) < 0.05 Conclusion: Onset time of sensory and motor block with grade 2 in the BD group is statistically significant shorter than that of B group, p < 0.05.