Table 5.

Principal component analysis of the placement variations of the transducer arrays: Placement variations along the principal components. Kolmogorov-Smirnov test: Test for comparison of the placement deviations from the overall mean per patient with a normal distribution

Array	First principal component		Second principal component		Third principal component
	Standard deviation [cm]	p-value Kolmogorov-Smirnov test	Standard deviation [cm]	p-value Kolmogorov-Smirnov test	Standard deviation [cm]	p-value Kolmogorov-Smirnov test
frontal	1.06	< 0.01	0.70	< 0.01	0.31	< 0.01
occipital	1.23	0.01	0.71	< 0.01	0.25	< 0.01
left	0.96	> 0.15	0.79	> 0.15	0.28	< 0.01
right	1.11	> 0.15	0.68	0.02	0.25	> 0.15