Fig. 2

Interdaily stability (a) and intradaily variability (b) in uncorrected vs. corrected data. a Interdaily stability (IS). The IS was overestimated and significantly higher in the uncorrected data (IS approaches 0 for Gaussian noise and converges to 1 for perfect IS). UWS and MCS/EMCS patients did not differ in both corrected and uncorrected data (cf. Additional file 1: Figures S4 A-B). b Intradaily variability (IV). The IV was also overestimated and significantly higher in the uncorrected data (IV converges to 0 for a perfect sine wave [i.e., no IV] and approaches 2 for Gaussian noise. Values > 2 indicate an ultradian component with a period length of 2 h). UWS and MCS/EMCS patients only differed in the uncorrected data (cf. Additional file 1: Figures S4 C-D). Horizontal lines represent the medians, boxes the interquartile range (IQR; distance between the 1^st [Q1] and 3^rd quartile [Q3]), and whiskers extend at most to Q1−1.5*IQR (lower whisker) and Q3+1.5*IQR (upper whisker). Asterisks indicate significance: ***p ≤ .001, **p ≤ .01. Abbreviations: MCS minimally conscious state, EMCS exit MCS, UWS unresponsive wakefulness syndrome