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Table 4 Measures taken from the ophthalmic, central retinal and carotid arteries in control and hypertensive participants

From: Ultrasound entropy may be a new non-invasive measure of pre-clinical vascular damage in young hypertensive patients

  

Controls

Participants with hypertension

Standardised differential mean

Confidence interval

p value

Ophthalmic artery

Entropy

1.36 (0.03)

1.24 (0.03)

0.12 (0.05)

0.009 to 0.22

0.017

 

Resistive index

0.88 (0.13)

0.73 (0.01)

0.15 (0.09)

−0.05 to 0.35

0.127

 

Pulsatility index

1.47 (0.26)

1.15 (0.19)

−0.103 (0.33)

−0.76 to 0.55

0.755

Central Retinal Artery

Entropy

1.25 (0.04)

1.14 (0.03)

0.11 (0.05)

0.004 to 0.215

0.040

 

Resistive index

0.92 (0.04)

0.81 (0.03)

0.12 (0.05)

0.005 to 0.226

0.029

 

Pulsatility index

2.69 (0.44)

1.73 (0.16)

0.96 (0.38)

0.19 to 1.73

0.015

Carotid Artery

Resistive index

0.79 (0.08)

0.78 (0.06)

0.02 (0.11)

−0.20 to 0.23

0.863

 

Pulsatility index

1.23 (0.42)

1.48 (0.16)

−0.25 (0.37)

−1.01 to 0.49

0.579

 

Entropy

1.32 (0.02)

1.28 (0.27)

0.04 (0.04)

−0.04 to 0.12

0.267

  1. Results are expressed as standardized differential mean (standard error of the mean) with confidence intervals and corresponding p value for any difference.