Coefficient of variation values for the stereometric parameters generated in the test-retest study
| Stereometric parameter | Coefficient of variation (%) | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| HRT Classic | HRT Explorer | HRT-II Explorer | ||||||||||
| I | II | III | IV | I | II | III | IV | I | II | III | IV | |
| I = intraobserver/intravisit; II = interobserver/intravisit; III = intraobserver/intervisit; IV = interobserver/intervisit. | ||||||||||||
| Low coefficient values equate to high repeatability. | ||||||||||||
| Cup area | 26 | 21 | 16 | 27 | 25 | 25 | 25 | 24 | 25 | 25 | 23 | 19 |
| Rim area | 7 | 11 | 7 | 10 | 9 | 10 | 9 | 10 | 9 | 12 | 7 | 8 |
| Cup volume | 26 | 27 | 23 | 30 | 27 | 30 | 31 | 30 | 32 | 37 | 29 | 26 |
| Rim volume | 16 | 19 | 15 | 17 | 18 | 19 | 19 | 19 | 18 | 22 | 17 | 18 |
| Reference height | 11 | 14 | 11 | 13 | 11 | 15 | 13 | 16 | 17 | 17 | 13 | 13 |
| Height variation contour | 14 | 12 | 15 | 15 | 13 | 16 | 14 | 16 | 20 | 15 | 20 | 16 |
| Maximum cup depth | 8 | 7 | 10 | 8 | 8 | 7 | 10 | 11 | 12 | 13 | 10 | 12 |
| Mean cup depth | 8 | 8 | 9 | 7 | 7 | 8 | 9 | 11 | 11 | 11 | 9 | 10 |
| Mean retinal nerve fibre layer thickness | 21 | 21 | 32 | 19 | 20 | 23 | 18 | 22 | 31 | 27 | 25 | 22 |
| Retinal nerve fibre layer cross sectional area | 22 | 21 | 22 | 19 | 20 | 23 | 18 | 22 | 31 | 27 | 25 | 22 |
| Cup shape measure | 19 | 28 | 28 | 23 | 24 | 32 | 32 | 27 | 24 | 26 | 28 | 29 |