The incidence of vocal cord sequelae was 11 out of 130 ( 8.5 % ) in the fiberoptic group versus 12 out of 129 ( 9.3 % ) in the control group ( chi-square = 0.057 , df = 1 , P = 0.81 ; upper limit of the one-sided 95 % confidence interval for the difference : +5.1 % ) .
