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

Table 3

CoG longitude (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	2.70 (1.04)	0.06 (−0.02 to 0.14)	0.99 (0.97 to 0.99)
Two	2.64 (1.01)	−0.01 (−0.04 to 0.02)	0.99 (0.99 to 0.99)
Three	2.67 (1.01)	0.02 (−0.01 to 0.06)	0.99 (0.99 to 0.99)
Four	2.66 (1.01)	0.02 (−0.07 to 0.11)	0.99 (0.97 to 0.99)
Five	2.64 (1.03)	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.