Fig. 2. Degree of antagonism at 10 min after neostigmine administration. Group I patients reversed at reappearance of the first tactile train-of-four (TOF) response, group II patients reversed at reappearance of the second tactile TOF response, group III patients reversed at reappearance of the third tactile TOF response, and group IV patients reversed at reappearance of the fourth tactile TOF response. TOF ratio < 0.7 (black columns), TOF ratio ≥ 0.7 and < 0.8 (grey columns), TOF ratio ≥ 0.8 and < 0.9, (hatched columns), and TOF ratio ≥ 0.9 (white columns).