Figure 2. Relationship between level of neuromuscular block and antagonism by edrophonium. The upper part of the diagram shows the level of block in every patient adequately antagonized (upward deflection) and inadequately antagonized (downward deflection). Adequate antagonism was defined as a TOF ratio greater or equal to 70% and inadequate antagonism as a TOF < 70%. In the lower part, the probability of adequate antagonism by edrophonium was estimated by logistic regression using this quantal data. Error bars indicate plus/minus SE of neuromuscular block with a 50% probability for adequate antagonism (NMBp50).