Table 1. EMG amplitude values of IONM in thyroid surgery by SMIA.

IONM signal	EMG amplitude (μV)	P value
V		0.973
V1	1,240±428
V2	1,236±672
R		0.849
R1	1,656±765
R2	1,676±778

EMG data are expressed as mean ± standard deviation. V, vagus nerve; R, recurrent laryngeal nerve; V1, EMG amplitude of the vagus nerve; V2, EMG amplitude of vagus nerve after thyroidectomy; R1, EMG amplitude at initial identification of recurrent laryngeal nerve; R2, EMG amplitude of stimulated recurrent laryngeal nerve after completion of recurrent laryngeal nerve dissection. EMG, electromyographic; IONM, intraoperative neuromonitoring; SMIA, sternocleidomastoid intermuscular approach.