Table 4.

Experienced and novice observer agreement for the indirect findings of PE found on contrast enhanced pulmonary magnetic resonance angiography.

Indirect Finding of PE at MRA	Consensus number of findings	Prevalence	N	kappa	95 % C.I.	P value
Pulmonary venous stasis, R1	10	11,12	56	0.40	0.11−0.69	0.003
Pulmonary venous stasis, R2	10	3,2	56	0.37	−0.18−0.93	0.004
Pulmonary venous stasis Inter-reader	10		56	0.06	−0.18−0.31	0.5
Atelectasis, R1	21	27,32	56	0.54	0.32−0.76	<0.0001
Atelectasis, R1	21	24,23	56	0.81	0.66−0.97	<0.0001
Atelectasis Inter-reader	21		56	0.67	0.49−0.87	<0.0001
Perfusion Defect, R1	42	39,37	56	0.59	0.37−0.82	<0.0001
Perfusion Defect, R2	42	37,41	56	0.66	0.45−0.87	<0.0001
Perfusion Defect, Inter-reader	42		56	0.51	0.27−0.75	0.0001
Effusion, R1	21	17,18	56	0.79	0.62−0.97	<0.0001
Effusion, R2	21	20,19	56	0.88	0.75−1.0	<0.0001
Effusion, Inter-reader	21		56	0.56	0.32−0.79	<0.0001
Pleural Enhancement, R1	22	10,14	56	0.47	0.20−0.75	0.0003
Pleural Enhancement, R2	22	23,19	56	0.70	0.51−0.88	<0.0001
Pleural Enhancement, Inter-reader	22		56	0.31	0.09−0.54	0.0058
White-Black-White, R1	34	22,14	56	0.60	0.39−0.81	<0.0001
White-Black-White, R2	34	20,25	56	0.67	0.47−0.86	<0.0001
White-Black-White, Inter-reader	34		56	0.47	0.23−0.71	0.0005
Pulmonary Infarction, R1	12	11,12	54	0.94	0.84−1.0	<0.0001
Pulmonary Infarction, R2	12	6,7	54	0.74	0.46−1.0	<0.0001
Pulmonary Infarction, Inter-reader	12		54	0.52	0.22−0.82	<0.0001
Blank Slate, R1	5	4,5	56	0.64	0.26−1.0	<0.0001
Blank Slate, R2	5	6,6	56	1.0	1.0−1.0	<0.0001
Blank Slate, Inter-reader	5		56	0.56	0.18−0.94	<0.0001

Abbreviations: PE- pulmonary embolism, C.I.- confidence interval, R1- reader 1 with 2 years of experience reading CE-MRA, R2- reader 2 with one month of experience reading CE-MRA.