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Research ArticleInterventional

Inter- and Intraobserver Agreement in Scoring Angiographic Results of Intra-Arterial Stroke Therapy

M. Gaha, C. Roy, L. Estrade, G. Gevry, A. Weill, D. Roy, M. Chagnon and J. Raymond
American Journal of Neuroradiology June 2014, 35 (6) 1163-1169; DOI: https://doi.org/10.3174/ajnr.A3828
M. Gaha
aFrom the Department of Radiology (M.G., C.R., G.G., A.W., D.R., M.C., J.R.), Centre Hospitalier de l'Université de Montréal Notre-Dame Hospital, Montreal, Quebec, Canada
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C. Roy
aFrom the Department of Radiology (M.G., C.R., G.G., A.W., D.R., M.C., J.R.), Centre Hospitalier de l'Université de Montréal Notre-Dame Hospital, Montreal, Quebec, Canada
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L. Estrade
bService de Radiologie (L.E.), Hôpital Maison Blanche, CHU Reims, France
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G. Gevry
aFrom the Department of Radiology (M.G., C.R., G.G., A.W., D.R., M.C., J.R.), Centre Hospitalier de l'Université de Montréal Notre-Dame Hospital, Montreal, Quebec, Canada
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A. Weill
aFrom the Department of Radiology (M.G., C.R., G.G., A.W., D.R., M.C., J.R.), Centre Hospitalier de l'Université de Montréal Notre-Dame Hospital, Montreal, Quebec, Canada
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D. Roy
aFrom the Department of Radiology (M.G., C.R., G.G., A.W., D.R., M.C., J.R.), Centre Hospitalier de l'Université de Montréal Notre-Dame Hospital, Montreal, Quebec, Canada
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M. Chagnon
aFrom the Department of Radiology (M.G., C.R., G.G., A.W., D.R., M.C., J.R.), Centre Hospitalier de l'Université de Montréal Notre-Dame Hospital, Montreal, Quebec, Canada
cDepartment of Mathematics and Statistics (M.C.), Université de Montréal, Montreal, Quebec, Canada.
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J. Raymond
aFrom the Department of Radiology (M.G., C.R., G.G., A.W., D.R., M.C., J.R.), Centre Hospitalier de l'Université de Montréal Notre-Dame Hospital, Montreal, Quebec, Canada
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  • Article
  • Figures & Data
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Article Figures & Data

Tables

    • View popup
    Table 1:

    Interobserver agreement using the TICI reperfusion scale

    Ob2Ob3Ob4Ob5Ob6Ob6aOb7Ob8Ob9
    Ob10.497 ± 0.0980.411 ± 0.1020.478 ± 0.1030.544 ± 0.1010.508 ± 0.1040.315 ± 0.1140.517 ± 0.1000.580 ± 0.1000.519 ± 0.094
    Ob20.419 ± 0.1000.286 ± 0.1020.576 ± 0.0960.506 ± 0.1020.320 ± 0.1150.458 ± 0.0960.538 ± 0.0990.330 ± 0.0890.330 ± 0.089
    Ob30.197 ± 0.0880.284 ± 0.1000.513 ± 0.1030.191 ± 0.0960.339 ± 0.1030.345 ± 0.1050.404 ± 0.103
    Ob40.510 ± 0.1000.343 ± 0.1030.352 ± 0.1030.384 ± 0.0980.583 ± 0.0980.297 ± 0.087
    Ob50.602 ± 0.1010.594 ± 0.1020.712 ± 0.0910.752 ± 0.0820.397 ± 0.094
    Ob60.525 ± 0.1070.465 ± 0.1080.610 ± 0.1010.425 ± 0.093
    Ob6a0.542 ± 0.0960.421 ± 0.1060.283 ± 0.085
    Ob70.511 ± 0.1020.442 ± 0.102
    Ob80.423 ± 0.095
    All observersκ = 0.44570 ± 0.013176; P < 0.001
    • Note:—Inter-observer Kappa values ≥ 0.6 are highlighted in bold type.

    • View popup
    Table 2:

    Interobserver agreement using the dichotomized TICI scale

    Ob2Ob3Ob4Ob5Ob6Ob6aOb7Ob8Ob9
    Ob10.773 ± 0.1040.634 ± 0.1160.546 ± 0.1380.674 ± 0.1210.679 ± 0.1170.329 ± 0.1560.628 ± 0.1220.727 ± 0.1130.578 ± 0.125
    Ob20.452 ± 0.1160.507 ± 0.1510.673 ± 0.1160.580 ± 0.1190.291 ± 0.1620.432 ± 0.1280.722 ± 0.1110.493 ± 0.118
    Ob30.452 ± 0.1160.517 ± 0.1350.724 ± 0.1130.337 ± 0.1330.665 ± 0.1240.576 ± 0.1260.717 ± 0.117
    Ob40.673 ± 0.1160.580 ± 0.1190.645 ± 0.1310.536 ± 0.1190.722 ± 0.1110.493 ± 0.118
    Ob50.784 ± 0.1010.674 ± 0.1190.73 ± 0.1110.946 ± 0.0530.677 ± 0.118
    Ob60.575 ± 0.1260.727 ± 0.1130.731 ± 0.1100.780 ± 0.103
    Ob6a0.634 ± 0.1160.614 ± 0.1290.483 ± 0.128
    Ob70.679 ± 0.1170.723 ± 0.115
    Ob80.734 ± 0.107
    All observersκ = 0.61569 ± 0.024507; P < 0.001
    • Note:—Inter-observer Kappa values ≥ 0.6 are highlighted in bold type.

    • View popup
    Table 3:

    Interobserver agreement using the AOL recanalization scale

    Ob2Ob3Ob4Ob5Ob6Ob6aOb7Ob8Ob9
    Ob10.132 ± 0.0660.241 ± 0.1030.288 ± 0.1180.196 ± 0.0960.425 ± 0.1160.607 ± 0.1150.199 ± 0.0910.265 ± 0.0860.382 ± 0.098
    Ob20.420 ± 0.1110.272 ± 0.0840.787 ± 0.1030.336 ± 0.0930.065 ± 0.0700.376 ± 0.1100.648 ± 0.1010.352 ± 0.106
    Ob30.304 ± 0.1020.553 ± 0.1050.575 ± 0.1060.258 ± 0.1090.474 ± 0.1080.535 ± 0.1090.595 ± 0.104
    Ob40.370 ± 0.0950.424 ± 0.1090.340 ± 0.1210.366 ± 0.0900.305 ± 0.0890.467 ± 0.103
    Ob50.514 ± 0.1050.263 ± 0.0950.461 ± 0.1100.733 ± 0.0930.533 ± 0.107
    Ob60.290 ± 0.1240.419 ± 0.1110.509 ± 0.1020.633 ± 0.101
    Ob6a0.264 ± 0.0910.265 ± 0.0860.445 ± 0.098
    Ob70.653 ± 0.1100.623 ± 0.116
    Ob80.550 ± 0.111
    All observersκ = 0.39434 ± 0.015957; P < 0.001
    • Note:—Inter-observer Kappa values ≥ 0.6 are highlighted in bold type.

    • View popup
    Table 4:

    Interobserver agreement using the dichotomized AOL scale

    Ob2Ob3Ob4Ob5Ob6Ob6aOb7Ob8Ob9
    Ob10.646 ± 0.1440.593 ± 0.1540.613 ± 0.1410.788 ± 0.1170.64 ± 0.1440.773 ± 0.1220.726 ± 0.1280.726 ± 0.1280.726 ± 0.128
    Ob20.65 ± 0.1530.802 ± 0.1070.853 ± 0.1010.85 ± 0.1010.682 ± 0.1460.788 ± 0.1170.788 ± 0.1170.929 ± 0.070
    Ob30.491 ± 0.1490.654 ± 0.1530.65 ± 0.1530.802 ± 0.1330.593 ± 0.1540.593 ± 0.1540.593 ± 0.154
    Ob40.802 ± 0.1070.802 ± 0.1070.654 ± 0.1350.742 ± 0.1200.742 ± 0.1200.871 ± 0.088
    Ob50.853 ± 0.1010.841 ± 0.1080.929 ± 0.0700.929 ± 0.0700.929 ± 0.070
    Ob60.682 ± 0.1460.788 ± 0.1170.788 ± 0.1170.929 ± 0.070
    Ob6a0.773 ± 0.1220.773 ± 0.1220.773 ± 0.122
    Ob70.863 ± 0.0940.863 ± 0.094
    Ob80.863 ± 0.094
    All observersκ = 0.76197 ± 0.024507; P < 0.001
    • Note:—Inter-observer Kappa values ≥ 0.6 are highlighted in bold type.

    • View popup
    Table 5:

    Intra- and interobserver agreement using TICI (3 observers)

    Intraobserver (All Images)Interobserver Agreement
    Observer 1Observer 2Observer 3QuestionnaireAll Images Session 1All Images Session 2
    Full TICI scale0.488 ± 0.1190.158 ± 0.1220.095 ± 0.1050.590 ± 0.0600.364 ± 0.0600.538 ± 0.060
    Dichotomized TICI0.716 ± 0.1320.216 ± 0.1790.246 ± 0.1760.699 ± 0.1000.489 ± 0.1100.678 ± 0.110
    • Note:—Inter-observer Kappa values ≥ 0.6 are highlighted in bold type.

    • View popup
    Table 6:

    Intra- and interobserver agreement using AOL (3 observers)

    Intraobserver (All Images)Interobserver Agreement
    Observer 1Observer 2Observer 1Observer 2Observer 1Observer 2
    Full AOL scale0.611 ± 0.1260.233 ± 0.1490.302 ± 0.1430.492 ± 0.0700.238 ± 0.0700.590 ± 0.070
    Dichotomized AOL0.731 ± 0.1450.790 ± 0.1420.626 ± 0.1680.787 ± 0.1000.561 ± 0.1100.870 ± 0.110
    • Note:—Inter-observer Kappa values ≥ 0.6 are highlighted in bold type.

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American Journal of Neuroradiology: 35 (6)
American Journal of Neuroradiology
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Inter- and Intraobserver Agreement in Scoring Angiographic Results of Intra-Arterial Stroke Therapy
M. Gaha, C. Roy, L. Estrade, G. Gevry, A. Weill, D. Roy, M. Chagnon, J. Raymond
American Journal of Neuroradiology Jun 2014, 35 (6) 1163-1169; DOI: 10.3174/ajnr.A3828

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Inter- and Intraobserver Agreement in Scoring Angiographic Results of Intra-Arterial Stroke Therapy
M. Gaha, C. Roy, L. Estrade, G. Gevry, A. Weill, D. Roy, M. Chagnon, J. Raymond
American Journal of Neuroradiology Jun 2014, 35 (6) 1163-1169; DOI: 10.3174/ajnr.A3828
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