Overall , the incidence of apnea ( 0 to 12 h ) was similar between arms ( 3 % in RA and 4 % in GA arms ; odds ratio [ OR ] , 0.63 ; 95 % CI , 0.31 to 1.30 , P = 0.2133 ) ; however , the incidence of early apnea ( 0 to 30 min ) was lower in the RA arm ( 1 vs. 3 % ; OR , 0.20 ; 95 % CI , 0.05 to 0.91 ; P = 0.0367 ) .