Despite significantly shorter fasting times for clear fluids in group A compared with group B ( 76/136 min ; P < 0.001 ) , no significant difference was observed regarding gastric pH [ 1.43 ( 1.30-1 .56 ) / 1.44 ( 1.29-1 .68 ) , P = 0.66 ] or residual volume [ 0.43 ( 0.21-0 .84 ) / 0.46 ( 0.19-0 .78 ) ml kg ( -1 ) , P = 0.47 ] .