Fig. 4

Change in the cognitive task performance (verbal fluency task) during the water-carry TUG assessment. (A) represents the mean number of correct responses provided in the verbal fluency task during the water-carry single-task TUG and the dual-task water-carry TUG in each group. (B) depicts individual data points. (C) depicts the cognitive dual-task effect during the water-carry TUG for each group. Blue bars represent the Non-Essential Tremor group, while orange bars represent the Essential Tremor group. Individual data points in each group are indicated by open-filled circles. DTE % = Dual Task Effect and was calculated as follows: ((Dual Task Performance – Single Task Performance) / Single Task Performance) *100. Therefore, positive values indicate facilitation that is improved performance (more correct responses) in the dual-task condition compared to the single task condition. Negative values indicate interference, that is, reduced performance (fewer correct responses) in the dual-task condition compared to the single-task condition.