Group C showed faster onsets of motor block ( 5 vs. 6 min ) , maximum sensory block level ( 8.5 vs. 14 min ) , resolution of sensory ( 105 vs. 225 min ) and motor ( 100 vs. 210 min ) blocks , unassisted ambulation ( 142.5 vs. 290.5 min ) , first analgesic requirement ( 120 vs. 293.5 min ) , and home discharge ( 150 vs. 325 min ) ( all comparisons , P < 0.05 ) .