Comparing Different Recording Lengths of Dynamic Cerebral Autoregulation: 5 versus 10 Minutes

Table 2

Agreements between dCA assessed for 5 and 10 mins.

All subjects ()	The first 5 mins, median (IQR)	The last 5 mins, median (IQR)	10 mins, median (IQR)	Mean difference ± 95% of agreement between the first 5 mins and 10 mins	Intraclass correlation coefficient between the first 5 mins and 10 mins (95% CI)
	0.37 (0.18–0.48)	0.34 (0.11–0.52)	0.35 (0.15–0.48)	0.02 ± 0.19	0.93 (0.90–0.96)
Phase Shift (Degree)
VLF (0.02–0.07 Hz)	55 (41–74)	56 (41–73)	57 (45–73)	−0.3 ± 28.1	0.87 (0.81–0.91)
LF^† (0.07–0.20 Hz)	39 (29–49)	36 (23–50)	36 (26–47)	0.6 ± 42.0	0.74 (0.62–0.82)
HF^† (0.20–0.50 Hz)	9 (−8–19)	9 (−3–22)	6 (−5–17)	−0.1 ± 37.6	0.76 (0.65–0.84)
Gain (cm/s/mmHg)
VLF (0.02–0.07 Hz)	0.43 (0.32–0.66)	0.47 (0.33–0.69)	0.30 (0.30–0.61)	0.05 ± 0.29^#	0.94 (0.90–0.96)
LF^† (0.07–0.20 Hz)	0.48 (0.34–0.65)	0.47 (0.35–0.62)	0.38 (0.28–0.55)	0.11 ± 0.27^#	0.77 (0.37–0.89)
HF^† (0.20–0.50 Hz)	0.49 (0.37–0.66)	0.48 (0.38–0.65)	0.38 (0.28–0.53)	0.14 ± 0.28^#	0.78 (0.25–0.91)
Coherence
VLF (0.02–0.07 Hz)	0.46 (0.29–0.62)	0.46 (0.24–0.63)	0.41 (0.25–0.59)	0.04 ± 0.22^#	0.80 (0.70–0.87)
LF (0.07–0.20 Hz)	0.33 (0.21–0.46)	0.30 (0.19–0.44)	0.25 (0.15–0.40)	0.06 ± 0.14^#	0.86 (0.44–0.95)
HF (0.20–0.50 Hz)	0.23 (0.16–0.29)	0.21 (0.16–0.27)	0.15 (0.10–0.21)	0.07 ± 0.13^#	0.69 (0.11–0.87)

compared to the first 5 mins; compared to the last 5 mins; mean difference = 0; ; CI: confidence interval.