Table 3 Concordance between pairs of pathologists using the three‐tier system.
| Rater 1 | Rater 2 | Weighted κ | Agreement | Disagreement | |
|---|---|---|---|---|---|
| By one tier | By two tiers | ||||
| A | B | 0.478 | 17 | 14 | 0 |
| A | C | 0.420 | 19 | 10 | 2 |
| A | D | 0.518 | 20 | 10 | 1 |
| A | E | 0.634 | 22 | 9 | 0 |
| A | F | 0.613 | 22 | 9 | 0 |
| B | C | 0.544 | 20 | 10 | 1 |
| B | D | 0.481 | 19 | 10 | 2 |
| B | E | 0.604 | 20 | 11 | 0 |
| B | F | 0.645 | 22 | 9 | 0 |
| C | D | 0.516 | 19 | 12 | 0 |
| C | E | 0.566 | 22 | 7 | 2 |
| C | F | 0.603 | 23 | 7 | 1 |
| D | E | 0.498 | 20 | 9 | 2 |
| D | F | 0.621 | 23 | 7 | 1 |
| E | F | 0.677 | 23 | 8 | 0 |
| Mean | 0.561 | 20.73 | 9.47 | 0.80 | |
| Median | 0.566 | 20 | 9 | 1 | |
| Minimum | 0.420 | 17 | 7 | 0 | |
| Maximum | 0.677 | 23 | 14 | 2 | |
| Total | 311 | 142 | 12 | ||
| Percentage | 66.88% | 30.54% | 2.58% |