Cardiovascular magnetic resonance feature tracking in small animals – a preliminary study on reproducibility and sample size calculation

Table 3 Inter-observer and intra-observer reproducibility for LV longitudinal, circumferential and radial strain

	Parameter	Mean difference ± SD	Limits of agreement	ICC (95% CI)
Inter-observer	Ell_LAX (%)	−1.65 ± 5.38	−12.2 to 8.90	0.73 (0.56 to 0.83)
	Ecc_SAX (%)	−2.37 ± 3.71	−9.64 to 4.89	0.79 (0.46 to 0.91)
	Err_SAX (%)	0.05 ± 6.94	−13.55 to 13.66	0.68 (0.37 to 0.84)
Intra-observer	Ell_LAX (%)	−1.25 ± 4.62	−10.30 to 7.79	0.83 (0.73 to 0.90)
	Ecc_SAX (%)	1.11 ± 4.79	−8.27 to 10.50	0.74 (0.49 to 0.87)
	Err_SAX (%)	−2.27 ± 6.98	−15.95 to 11.42	0.69 (0.41 to 0.84)

Results are reported as mean ± standard deviation. ICC intraclass correlation coefficient, CI confidence interval. Other abbreviations as in Table 2

ISSN: 1471-2342