Validity, intra- and inter-observer reliability of automated devices for the assessment of ankle brachial index using photo-plethysmography

Table 2 Intra-observer concordances of ABI measurements

Method	CCC	95%-CI of CCC		Bias	p-value	Correlation
VI	0.65	0.46	0.78	0.015	0.29	0.65
VI_O	0.68	0.51	0.80	0.001	0.95	0.68
VI_E	0.65	0.47	0.78	0.006	0.65	0.66
VE	0.65	0.50	0.76	-0.011	0.43	0.66
VE_O	0.75	0.59	0.85	-0.004	0.75	0.75
VE_E	0.76	0.57	0.87	-0.002	0.89	0.76
VE_D	0.57	0.27	0.78	0.021	0.12	0.59

Agreement of first and second ABI measurement for automated methods. We present concordance correlation coefficients, corresponding confidence intervals, bias between first and second measurements (values less than zero mean lower values at first measurement), p-value of bias and correlation coefficient of first and second measurement.
VI/VE = Vicorder/Vascular Explorer standard measurements, VI_O/VE_O = Vicorder/Vascular Explorer corrected by observer, VI_E/VE_E = Vicorder/Vascular Explorer corrected by examiner, VE_D = deflation method of Vascular Explorer.

ISSN: 1471-2261