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. Author manuscript; available in PMC: 2012 Jun 7.
Published in final edited form as: Eur Radiol. 2011 May 26;21(10):2111–2120. doi: 10.1007/s00330-011-2152-0

Table 4.

Intra-observer variability of right and left ventricular ejection fraction related to the selection of the same basal/apical slice and end systolic phase during the 2 measurements.

Observer 1 Observer 2 Observer 3

RV LV RV LV RV LV
All measurements
 N (%) 60 (100) 60 (100) 60 (100) 60 (100) 60 (100) 60 (100)
 Mean (%) 53.2 ± 11.4 55.3 ± 15.2 55.5 ± 11.5 52.9 ± 15.7 52.0 ± 10.6 54.8 ± 15.9
 Mean difference (%) − 1.3 ± 4.1 − 0.7 ± 3.0 − 0.7 ± 6.5 0.5 ± 4.9 1.4 ± 10.5 − 0.5 ± 5.9
 CV (%) 7.8 5.4 11.7 9.4 20.2 10.7
 ICC 0.931 0.980 0.854 0.952 0.605 0.935
Same basal slice selected
 N (%) 44 (73) 44 (73) 34 (57) 37 (62) 38 (63) 39 (65)
 Mean (%) 52.5 ± 12.3 56.0 ± 15.4 55.1 ± 13.7 55.9 ± 15.3 50.9 55.7 ± 16.0
 Mean difference (%) −0.8 ± 3.3 − 0.2 ± 2.1 0.3 ± 3.6 0.6 ± 3.3 0.7 ± 6.7 0.9 ± 4.1
 CV (%) 6.4 3.7 6.6 6.0 13.1 7.3
 ICC 0.962 0.991 0.966 0.976 0.807 0.967
Same apical slice selected
 N (%) 44 (73) 48 (80) 41 (68) 44 (73) 28 (47) 40 (67)
 Mean (%) 54.6 ± 10.7 55.3 ± 15.1 54.6 ± 11.2 50.2 ± 17.0 52.1 ± 10.5 54.2 ± 17.0
 Mean difference (%) −1.3 ± 4.2 − 0.5 ± 2.7 0.3 ± 5.6 0.2 ± 4.8 1.2 ± 8.5 −0.5 ± 5.9
 CV (%) 7.6 4.9 10.3 9.6 16.3 10.8
 ICC 0.922 0.984 0.884 0.962 0.720 0.943
Same systolic phase selected
 N (%) 48 (80) 48 (80) 36 (60) 36 (60) 21 (35) 21 (35)
 Mean (%) 54.5 ± 10.4 55.7 ± 15.7 58.4 ± 9.6 55.2 ± 13.2 53.7 ± 9.0 55.9 ± 17.4
 Mean difference (%) −1.4 ± 4.1 − 0.6 ± 3.2 −0.2 ± 6.1 0.3 ± 5.5 1.6 ± 7.8 1.0 ± 3.9
 CV (%) 7.5 5.7 10.4 9.9 14.5 7.1
 ICC 0.919 0.979 0.823 0.920 0.686 0.974
Same basal/apical slices and ES phase selected
 N (%) 25 (42) 27 (45) 15 (25) 16 (27) 5 (8) 9 (15)
 Mean (%) 54.9 ± 11.6 58.3 ± 14.6 57.2 ± 11.5 55.2 ± 12.3 53.8 ± 3.5 50.7 ± 18.9
 Mean difference (%) − 0.7 ± 2.9 0.1 ± 1.8 0.1 ± 3.8 0.6 ± 3.4 −2.9 ± 4.5 2.4 ± 3.1
 CV (%) 5.4 3.1 6.6 6.1 8.5 6.1
 ICC 0.968 0.993 0.951 0.964 0.355 0.980

Note. RV = right ventricle; LV = left ventricle; EF = ejection fraction; CV = coefficient of variation, expressed as a percentage; ICC = intraclass correlation coefficient; ES = end systole.

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