RESULTS	During CPR with a bag/endotracheal tube , the target of both a compression rate of 90-110 min ( -1 ) and a ventilation rate of 8-11 min ( -1 ) was achieved in 3/34 CPR sessions ( 9 % ) for the control group and 33/34 sessions ( 97 % ) for the metronome group ( p < 0.001 ) .\