. 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 2.

Intra-observer analyses for the 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	22.5 ± 8.3	−0.4	−1.3 to 0.4	0.27	0.99^*	(p < 0.01)	4
TSV (ms)	65 ± 15	65 ± 15	−0.9	−1.8 to 0.1	0.07	0.99^*	(p < 0.01)	0
PDV (cm/s)	19.8 ± 6.8	20.2 ± 7.1	−0.5	−1.9 to 0.9	0.48	0.97^*	(p < 0.01)	11
TDV (ms)	387 ± 51	391 ± 54	−0.4	−10.8 to 2.0	0.16	0.99^*	(p < 0.01)	3
meanV_max (cm/s)	11.3 ± 3.5	11.8 ± 3.4	−0.5	−0.8 to−0.1	0.01^*	0.99^*	(p < 0.01)	4
PSV/meanV_max	2.0 ± 0.6	1.9 ± 1.5	0.1	−0.0 to 0.1	0.12	0.99^*	(p < 0.01)	5
PDV/meanV_max	1.8 ± 0.4	1.7 ± 0.5	0.0	−0.1 to 0.1	0.56	0.94^*	(p < 0.01)	8
PSV/PDV	1.2 ± 0.4	1.2 ± 0.4	0.0	−0.1 to 0.1	0.97	0.97^*	(p < 0.01)	9
Flow volume (ml/cycle)	11.4 ± 5.4	12.3 ± 6.4	−0.9	−1.8 to 0.1	0.07	0.97^*	(p < 0.01)	11

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. Repeated analyses were compared using the paired t-test, mean difference, 95% confidence intervals (95% CIs) and p-values were given. Agreement between intra-observer analyses was evaluated using intraclass correlation coefficients (ICCs) for absolute agreement.

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