The number of successful intubation cases were 4 eyes , 15 eyes , 13 eyes , 12 eyes and the intubation success rate was 26.67 % , 88.24 % , 76.74 % , 75.00 % according the angle of head hypsokinesis 10 group ( 15 eyes ) , 20 group ( 17 eyes ) , 30 group ( 17 eyes ) , 40 group ( 16 eyes ) .