Table 3 Association between NIRS measurements and ECHO-Doppler markers of Aortic flow

 VTI Mean: 0.11 (0.03) meter

ICC: < 0.10

β(95%CI): −23(− 214–168)

p-value: 0.81

30 observations

ICC: < 0.10

β(95%ΧΙ): 60(− 144–265)

p-value: 0.56

30 observations

ICC: 0.75

β(95%CI): 39(−70–148)

p-value: 0.48

36 observations

ICC: 0.48

β(95%CI): −40(− 107–114)

p-value: 0.95

36 observations

 Output Mean: 492 (136) or 500^a (149) mL/kg/min

ICC: < 0.10

β(95%CI): − 0.01(− 0.05–0.02)

p-value: 0.47

30 observations

ICC: < 0.10

β(95%CI): 0.02(− 0.02–0.06)

p-value: 0.29

30 observations

ICC: 0.75

β(95%CI): − 0.02(− 0.04 – − 0.002)

p-value: 0.03

36 observations

ICC: 0.47

β(95%CI): 0.02(.01–0.04)

p-value: 0.006

36 observations

 Peak systolic velocity of the ascending Aorta (suprasternal view) Mean: 0.91 (0.21) or 0.93 (0.21)^a

ICC: < 0.10

β(95%CI): −8(− 33–17)

p-value: 0.54

30 observations

ICC: < 0.10

β(95%CI): 13(− 14–40)

p-value: 0.33

30 observations

ICC: 0.66

β(95%CI): − 6(− 20–8)

p-value: 0.39

36 observations

ICC: 0.48

β(95%CI): 12(− 2–26)

p-value: 0.09

36 observations

 VTI Mean: 0.04 (0.02) meter

ICC: 0.12

β(95%CI): 4(−137–144)

p-value: 0.96

56 observations

ICC: 0.95

β(95%CI): − 27(− 177–123)

p-value: 0.72

55 observations

ICC: 0.61

β(95%CI): 46(− 33–124)

p-value: 0.25

69 observations

ICC: 0.50

β(95%CI): −47(− 132–38)

p-value: 0.28

68 observations

 Output Mean: 126 (56) or 122^a (53) mL/kg/min

ICC: 0.11

β(95%CI): 0.01(−0.05–0.07)

p-value: 0.85

56 observations

ICC: 0.02

β(95%CI): − 0.02(− 0.08–0.05)

p-value: 0.63

55 observations

ICC: 0.59

β(95%CI): 0.01(− 0.03–0.04)

p-value: 0.64

69 observations

ICC: 0.57

β(95%CI): 0.01(− 0.03–0.04)

p-value: 0.74

68 observations

 Peak systolic velocity Mean: 0.52 (0.20) or 0.51^a (0.19) m/s

ICC: 0.11

β(95%CI): −1(− 18–15)

p-value: 0.87

56 observations

ICC: 0.04

β(95%CI): 0.1 (− 18–19)

p-value: 0.99

55 observations

ICC: 0.60

β(95%CI): 3(− 5–12)

p-value: 0.44

69 observations

ICC: 0.53

β(95%CI): − 1(− 11–9)

p-value: 0.84

68 observations

 VTI Mean 0.11 (0.05) meter

ICC: 0.83

β(95%CI): 180(108–252)

p-value: < 0.001

21 observations

ICC: 0.71

β(95%CI): − 188(− 264 – − 111)

p-value: < 0.001

20 observations

ICC: 0.37

β(95%CI): 71(7–135)

p-value: 0.03

25 observations

ICC < 0.10

β(95%CI): − 94(− 161 – − 28)

p-value: 0.005

24 observations

 Output Mean: 279 (122) or 273^a (124) mL/kg/min

ICC: 0.23

β(95%CI): 0.03(−0.01–0.08)

p-value: 0.16

21 observations

ICC: 0.03

β(95%CI): − 0.05(− 0.10 – − 0.01)

p-value: 0.03

20 observations

ICC: 0.96

β(95%CI): 0.018 (0.002–0.034)

p-value: 0.02

25 observations

ICC: 0.98

β(95%CI): − 0.03(− 0.04 – − 0.01)

p-value: < 0.001

24 observations

 Peak systolic velocity Mean: 0.94 (0.32) or 0.97^a (0.33) m/s

ICC: 0.47

β(95%CI): 23(7–38)

p-value: 0.004

21 observations

ICC: 0.38

β(95%CI): − 37(− 50 – − 23)

p-value: < 0.001

20 observations

ICC: 0.92

β(95%CI): 7(−2–16)

p-value: 0.129

25 observations

ICC: 0.88

β(95%CI): − 8(− 19–3)

p-value: 0.17

24 observations