. Author manuscript; available in PMC: 2011 May 1.

Published in final edited form as: J Magn Reson Imaging. 2010 May;31(5):1215–1223. doi: 10.1002/jmri.22144

Table 3.

Inter-observer analyses for coronary artery flow velocity indices.

	Scan 1	Scan 1	Paired t-test	95% CI	p-value	Correlation		COV(%)
	mean ± sd	mean ± sd	Mean difference	95% CI	p-value	ICC	p-value	COV(%)
PSV (cm/s)	22.1 ± 8.4	22.7 ± 10.3	−0.6	−2.2 to 1.0	0.42	0.98^*	(p < 0.01)	8
TSV (ms)	65 ± 15	72 ± 26.4	−6.6	−16.9 to 3.7	0.19	0.76^*	(p = 0.05)	27
PDV (cm/s)	19.8 ± 6.8	21.0 ± 6.8	−1.2	−2.2 to −0.2	0.02^*	0.98^*	(p < 0.01)	7
TDV (ms)	387 ± 51	398 ± 66	−10.9	−37.1 to 15.3	0.39	0.81^*	(p < 0.01)	11
meanV_max (cm/s)	11.3 ± 3.5	11.8 ± 3.8	−0.0	−0.4 to 0.3	0.81	0.94^*	(p < 0.01)	3
PSV/meanV_max	2.0 ± 0.6	2.0 ± 0.7	0.0	−0.2 to 0.1	0.66	0.99^*	(p < 0.01)	9
PDV/meanV_max	1.8 ± 0.4	1.9 ± 3.4	−0.1	−0.3 to 0.0	0.07	0.96^*	(p < 0.01)	9
PSV/PDV	1.2 ± 0.5	1.1 ± 0.5	0.1	−0.1 to 0.2	0.27	0.88^*	(p < 0.01)	12
Flow volume (ml/cycle)	11.4 ± 5.4	9.9 ± 5.1	1.5	0.3 to 2.7	0.02^*	0.94^*	(p < 0.01)	14

PSV: peak systolic velocity in cm/s; TSV: time of PSV in ms; PDV: peak diastolic velocity in cm/s; TDV: time of PDV in ms; meanV_max: maximal velocity averaged over the cardiac cycle; PSV/meanV_max: measure for discriminating the systolic peak in the velocity-time graph; PDV/meanV_max: measure for discriminating the diastolic peak in the velocity-time graph; PSV/PDV: ratio between systolic and diastolic peak velocity; Flow volume: the total amount of coronary flow volume (ml/cycle).

Mean and standard deviations (SD) are given for the flow velocity indices. Analyses between observers were compared using the paired t-test, mean difference, 95% confidence intervals (95% CIs) and p-values were given. Agreement between observers was evaluated using intraclass correlation coefficients (ICCs) for absolute agreement.

p<0.05. Furthermore coefficients of variance (COVs) were given.