Table 1 Fleiss’ kappa for inter-rater reliability of OF-pelvis subgroups 1 to 5 on the first and second surveys (Total: complete rater cohort, DR: developing rater, UR: user rater). For each survey the absolute agreement of the raters choice with the “gold standard” is given
From: OF-Pelvis classification of osteoporotic sacral and pelvic ring fractures
First survey | Second survey | ||||||
|---|---|---|---|---|---|---|---|
0.95 CI | Absolute agreement | 0.95 CI | Absolute agreement | ||||
Kappa | (lower–upper limit) | Kappa | (lower–upper limit) | ||||
Total | OF-Pelvis | 0.764 | (0.754–0.774) | 89% | 0.790 | (0.780–0.800) | 90% |
OF1 | 0.790 | (0.769–0.810) | 86% | 0.809 | (0.789–0.829) | 87% | |
OF2 | 0.815 | (0.795–0.835) | 94% | 0.852 | (0.832–0.872) | 99% | |
OF3 | 0.708 | (0.688–0.729) | 87% | 0.750 | (0.730–0.770) | 89% | |
OF4 | 0.717 | (0.697–0.738) | 90% | 0.747 | (0.727–0.768) | 90% | |
OF5 | 0.827 | (0.807–0.847) | 86% | 0.808 | (0.788–0.828) | 86% | |
DR | OF-Pelvis | 0.776 | (0.754–0.799) | 90% | 0.813 | (0.790–0.836) | 91% |
OF1 | 0.772 | (0.727–0.816) | 87% | 0.867 | (0.823–0.912) | 88% | |
OF2 | 0.796 | (0.751–0.840) | 91% | 0.831 | (0.786–0.875) | 98% | |
OF3 | 0.727 | (0.682–0.771) | 88% | 0.809 | (0.765–0.854) | 90% | |
OF4 | 0.752 | (0.708–0.797) | 92% | 0.775 | (0.731–0.820) | 94% | |
OF5 | 0.866 | (0.821–0.910) | 88% | 0.798 | (0.754–0.842) | 85% | |
UR | OF-Pelvis | 0.748 | (0.727–0.769) | 88% | 0.766 | (0.746–0.785) | 90% |
OF1 | 0.818 | (0.777–0.859) | 85% | 0.759 | (0.721–0.797) | 85% | |
OF2 | 0.827 | (0.786–0.869) | 97% | 0.866 | (0.828–0.904) | 99% | |
OF3 | 0.671 | (0.630–0.712) | 86% | 0.704 | (0.666–0.742) | 89% | |
OF4 | 0.684 | (0.642–0.725) | 89% | 0.714 | (0.676–0.752) | 88% | |
OF5 | 0.779 | (0.738–0.820) | 83% | 0.805 | (0.767–0.844) | 87% |