Table 2. Carotid Ultrasonographic Characteristics according to IPN.

Characteristics	No IPN Group (n = 101)	IPN Group (n = 116)	P
Maximal thickness of plaque, mm	2.61 ± 0.84	2.86 ± 1.01	0.046
Left CCA PSV, cm/s	51.10 ± 18.76	52.19 ± 21.78	0.932
Right CCA PSV, cm/s	49.71 ± 20.26	48.40 ± 22.43	0.821
Average CCA PSV, cm/s	48.38 ± 18.69	48.88 ± 21.52	0.858
Left CCA EDV, cm/s	12.21 ± 6.11	13.79 ± 7.36	0.906
Right CCA EDV, cm/s	12.02 ± 6.43	12.88 ± 6.57	0.767
Average CCA EDV, cm/s	11.63 ± 6.03	13.04 ± 6.62	0.107
Left ICA PSV, cm/s	59.15 ± 34.72	66.87 ± 51.59	0.361
Right ICA PSV, cm/s	65.61 ± 60.79	55.56 ± 26.00	0.167
Average ICA PSV, cm/s	60.75 ± 39.23	60.17 ± 33.37	0.908
Left ICA EDV, cm/s	19.28 ± 11.99	23.23 ± 18.95	0.380
Right ICA EDV, cm/s	21.72 ± 19.49	19.65 ± 10.87	0.542
Average ICA EDV, cm/s	19.76 ± 13.53	21.06 ± 12.50	0.471
Average RI of CCA	0.75 ± 0.09	0.71 ± 0.13	0.007

CCA = common carotid artery, EDV = end-diastolic velocity, ICA = internal carotid artery, PSV = peak systolic velocity, RI = resistive index