Women indicating that they had been in labour for @hours or longer at the time of hospital admission were at elevated risk for cesarean birth , relative risk ( RR ) @ , ( @ % Confidence Intervals @-@ @ ) , admission with a cervical dilation of @cm or less , RR @ ( @-@ @ ) , more obstetrical interventions including continuous electronic fetal monitoring RR @ ( @-@ @ ) , augmentation of labour RR @ ( @-@ @ ) , use of narcotic RR @ ( @-@ @ ) and epidural analgesia RR @ ( @-@ @ ) .