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Kappa statistics for inter-test agreement between whether the ISNT rule and the ISNT rule variants were obeyed in disc photos versus RNFL thickness measurements.
| Kappa statistics | |
|---|---|
| ISNT rule | 0.06 |
| IST rule | 0.12 |
| IS rule | 0.03 |
| T thinnest rule | 0.03 |
ISNT rule = inferior > superior > nasal > temporal
IST rule = inferior > superior > temporal
IS rule = inferior > superior
T thinnest rule = temporal quadrant being the thinnest or the most narrow
