Parameters Group I Group II Group III P Value
Onset to T6 (min) 5.71 ± 0.13 5.81 ± 0.13 5.82 ± 0.14 >0.05
Onset to T4 (min) 10.27 ± 0.14 12.1 ± 0.21 15.87 ± 0.15* <0.01*
Motor Block (min) B1 1.73 ± 0.05 1.8 ± 0.14 2.1 ± 0.17 >0.05 
B2 4.68  ± 0.11 5.27  ± 0.13* 5.53  ± 0.09* <0.001*
B3 8.93 ± 0.12* 9.97  ± 0.12* 11.37  ±  0.13* <0.001*
Total Power Regain (min) B0 153.67 ± 2.51 132.06 ± 1.76* 121.0 ± 2.11* <0.001*
Demand of Rescue Analgesia (min) 133.66 ± 1.89 165.00 ± 1.84* 188.67 ± 1.64* <0.001*
Maximum Block Height T2(T2-T4) T4 (T3-T6) T5 (T3-T5) -
Time (min) of Two Segment Regression (T4-T6) 70 ± 17.94 80 ± 18.56 86 ± 19.86 -
*P<0.01 **P<0.001
Table 2: Onset of Motor and sensory block (time in minutes).