Determining the Optimal Number of Stimuli per Cranial Site during Transcranial Magnetic Stimulation Mapping

Table 2

CoG latitude (in cm away from vertex) for varying numbers of stimuli per cranial site.

Number of stimuli per cranial site	Mean (SD)	Mean difference with reference standard (95% CI)	ICC (95% CI)
One	3.40 (0.85)	0.10 (−0.01 to 0.20)	0.97 (0.92 to 0.99)
Two	3.31 (0.79)	0.01 (−0.02 to 0.04)	0.99 (0.99 to 0.99)
Three	3.32 (0.81)	0.02 (−0.02 to 0.06)	0.99 (0.99 to 0.99)
Four	3.32 (0.81)	0.02 (−0.02 to 0.05)	0.99 (0.99 to 0.99)
Five	3.30 (0.80)	NA	1.00 (NA)

Key: SD = standard deviation, ICC = intraclass correlation coefficient with five stimuli per cranial site (the “true” value), CI = confidence interval, and NA = not applicable.