RESULTS	The operative delivery ( cesarean or instrumental ) rate for NRFS did not differ between the 2 groups : 33.6 % ( 134/399 ) in the cardiotocography + STAN analysis group vs 37 % ( 148/400 ) in the cardiotocography group ( relative risk , 0.91 ; 95 % CI , 0.75-1 .10 ) .\