Fig. 3. The resting tension (mmHg) in the upper esophageal sphincter versus train-of-four (TOF) ratio during partial paralysis. Mean ± 1 SD. *P < 0.01. (Regression for each individual followed by t test for the mean regression coefficient of the group. The Wilcoxon signed rank test was used to detect differences between TOF ratio > 0.90 and control.)