Table 1.

Mean POC

	Deep		Open
	Mean	SD	Mean	SD
Beginning of the treatment	82.1	9.1	80	8.4
Before surgical intervention 1	79.5	7.2	79.2	8.9
Before surgical intervention 2	77.1	11.1	76.5	11.2
After surgical intervention 1	78.5	14.2	78.3	7.6
After surgical intervention 2	85.6	8.3	85.8	10.2
End of the treatment	84.4	8.9	84	7.9

Values are expressed in microvolts.