Figure 2. Probability curve for successful rapid tracheal intubation with rocuronium generated from the model parameters derived from the original dataset (see Figure 1 ) by logistic regression. Fractional success in each rocuronium dose group is represented by the open circles (error bars are the SD). The calculated doses giving 50%, 90%, and 95% probability of successful intubation are filled circles, and the error bars are the 5th and 95th percentile range for these estimates.