Figure 3. Rocuronium dose plotted against duration of action (open circles). The line is the regression of duration versus dose (duration of action = 65.8 [middle dot] dose - 21.3; r2= 0.64; P < 0.005). There are fewer than 20 circles in each group because of overlapping values. The filled boxes are the 95th percentile estimates for the duration of each dose, and the broken line simply connects these points.