Fig. 4.

Inter-rater agreement on determination of cortical SSEP amplitudes. This figure illustrates the inter-rater agreement on determination of cortical SSEP amplitudes by four independent raters in 100 patients. A SSEPs were categorized into excluded due to noise, bilaterally absent, up to 0.5 µV, larger than 0.5–2.5 µV, and above 2.5 µV. Percentage of agreement between all four raters (black bar), three raters (gray bar), and less or equal two raters (white bar) for the SSEP categories are shown. B Percentage of agreement between all four raters (black bar), three raters (gray bar), and less or equal two raters (white) are shown for the clinical outcome groups. SSEP somatosensory evoked potential, excl. excluded, CPC cerebral performance category