Table 4: Agreement between the two readings for each radiologist (intra observer variability) (P value < 0.01)†.
| Kappa value (95% C.I.) | Agreement between first and second reading |
| 0.68 (0.64 - 0.77) | Observer 1 |
| 0.58 (0.50 - 0.60) | Observer 2 |
| 0.49 (0.47 - 0.49) | Observer 3 |
†Statistical significance was tested by Chi-square test.