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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.