Table 2.

Reproducibility analysis.

Intra-reader reproducibility	1st Reading	2nd Reading		Bland–Altman			ICC (95% CI)	CV (%)
				Bias ± SD	95% CI	Coefficient of repeatability
CCA IMT, mm	Mean ± SD	Mean ± SD	P-value
Left	0.70 ± 0.16	0.71 ± 0.17	0.55	−0.003 ± 0.04	−0.01 to 0.01	0.08	0.97 (0.95–0.98)	4.15
Right	0.69 ± 0.16	0.68 ± 0.15	0.03	0.01 ± 0.04	0.001 to 0.02	0.08	0.97 (0.95–0.98)	3.97
Diameter, mm
Left	6.06 ± 0.69	6.02 ± 0.71	0.27	0.04 ± 0.25	−0.03 to 0.10	0.50	0.93 (0.89–0.96)	2.98
Right	6.17 ± 0.73	6.15 ± 0.63	0.45	0.02 ± 0.22	−0.04 to 0.08	0.44	0.95 (0.91–0.97)	2.52
Plaque, mm
Left	2.2 ± 0.5	2.1 ± 0.4	0.26	0.07 ± 0.2	−0.4 to 0.5	0.40	0.93 (0.80–0.97)	8.49
Right	2.2 ± 0.8	2.2 ± 0.7	0.55	−0.03 ± 0.2	−0.4 to 0.3	0.40	0.98 (0.95–0.99)	6.70
Inter-reader reproducibility	Reader 1	Reader 2		Bland–Altman			ICC (95% CI)	CV (%)
				Bias ± SD	95% CI	Coefficient of repeatability
CCA IMT, mm	Mean ± SD	Mean ± SD	P-value
Left	0.71 ± 0.17	0.70 ± 0.17	0.57	0.004 ± 0.06	−0.01 to 0.02	0.12	0.97 (0.95–0.98)	5.71
Right	0.68 ± 0.16	0.69 ± 0.16	0.19	−0.008 ± 0.05	−0.02 to 0.004	0.10	0.98 (0.96–0.99)	4.86
Diameter, mm
Left	6.04 ± 0.69	5.87 ± 0.73	<0.0001	0.17 ± 0.26	0.10 to 0.24	0.52	0.95 (0.86–0.98)	3.63
Right	6.16 ± 0.67	6.06 ± 0.71	0.0006	0.10 ± 0.21	0.04 to 0.15	0.42	0.97 (0.94–0.98)	2.67
Plaque, mm
Left	2.1 ± 0.5	2.0 ± 0.5	0.21	0.07 ± 0.2	−0.3 to 0.5	0.4	0.95 (0.86–0.98)	7.09
Right	2.2 ± 0.8	2.3 ± 1.1	0.26	−0.1 ± 0.4	−0.9 to 0.7	0.8	0.95 (0.86–0.98)	12.69

Abbreviations: CCA – common carotid artery; IMT – intima-media thickness; ICC – intraclass correlation coefficient; CV – coefficient of variation.