Table 2: Agreement between Pairs of radiologists (interobserver variability) for first and second round reading (P value < 0.05)†.
| Observer | First round K value (95% confidence interval) | % agreement (n/na) | Second round K value (95% confidence interval) | % agreement (n/na) |
| Between observer 1,2 | 0.36 (0.31- 0.59) | 62.5 (125/200) | 0.59 (0.57- 0.60) | 65 (130/200) |
| Between observer 1,3 | 0.38 (0.28- 0.49) | 71 (142/200) | 0.50 (0.47- 0.50) | 75 (150/200) |
| Between observer 2,3 | 0.56 (0.47- 0.59) | 82.5 (165/200) | 0.57 (0.55- 0.60) | 90.5 (181/200) |
†Statistical significance was tested by Chi-square test; n/na: Number of agreed cases/total number of cases.