Comparison of non-triggered magnetic resonance imaging and echocardiography for the assessment of left atrial volume and morphology

Table 3 Inter- observer agreement

	Observer 1	Observer 2	Bias (LoA)	%Bias	Pearson r	ICC (95% CI)
All Patients
TTE, ml (±SD)	79 ± 27	77 ± 27	2 (−22–24)	2%	0.91^a	0.95 (0.92–0.97)
CE-MRA, ml (±SD)	111 ± 45	101 ± 43	10 (−6–25)	9%	0.98^a	0.99 (0.99–0.99)
Sinus rhythm
TTE, ml (±SD) (n = 41)	75 ± 19	72 ± 19	3 (−19–26)	5%	0.82^a	0.90 (0.82–0.95)
CE-MRA, ml (±SD) (n = 15)	92 ± 23	84 ± 23	9 (−6–23)	10%	0.95^a	0.97 (0.92–0.99)
Atrial Fibrillation
TTE, ml (±SD) (n = 24)	8 ± 37	86 ± 35	-2 (−25–22)	2%	0.95^a	0.97 (0.94–0.99)
CE-MRA, ml (±SD) (n = 14)	117 ± 35	110 ± 34	8 (−5–20)	7%	0.98^a	0.99 (0.97–1.00)

Abbreviations: CE-MRA contrast enhanced magnetic resonance imaging, ICC intraclass correlation coefficient, TTE transthoracic echocardiography
^aSignificant at p < 0.01

ISSN: 1476-7120