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Test–retest reliability, interobserver reliability and intersensor reliability, presented as intraclass correlation (ICC), separate for each signal, response type and interval. The ICCs are computed from the filtered signals. The dotted lines delineate ICC scores regarded as excellent, good, fair and poor, as indicated in the right panels. An absent bar signifies an ICC of zero or lower. O2Hb oxygenated hemoglobin, HHb deoxygenated hemoglobin, TSI tissue saturation index
