On the operated side , the highest sensory block was T8 ( T12-T2 ) in the unilateral and T9 ( T11-T4 ) in the bilateral group ( P = 0.0328 ) ; the time to motor ( 115 26 min in the unilateral and 108 24 min in the bilateral groups , P = 0.2350 ) and sensory ( 156 30 min in the unilateral and 158 26 min in the bilateral groups , P = 0.7550 ) block resolution was similar in both groups .