Table 3. Agreement of total retinal thickness between OCT devices.
Mean difference (bias; μm) and 95% limits of agreement (μm) for mean retinal thickness at session 1 produced by the Iowa Reference Algorithms, using AEL-dependent scaling, for each pairing of OCT instruments.
| Fovea | Inner ring | Outer ring | ||
|---|---|---|---|---|
| 1040nm-Topcon | Mean difference | -14.18 | -7.05 | 0.80 |
| Limits of agreement | -20.05 to -8.30 | -14.65 to 0.55 | -6.95 to 8.55 | |
| Friedman test P | 0.000* | 0.000* | 0.317 | |
| 1040nm-Zeiss | Mean difference | -13.89 | -12.46 | -6.62 |
| Limits of agreement | -21.62 to -6.16 | -18.91 to -6.00 | -13.53 to 0.30 | |
| Friedman test P | 0.000* | 0.000* | 0.000* | |
| Topcon-Zeiss | Mean difference | -0.21 | -5.41 | -7.42 |
| Limits of agreement | -4.18 to 3.75 | -8.67 to -2.15 | -10.66 to -4.17 | |
| Friedman test P | 0.841 | 0.000* | 0.000* |
*significant at 0.05 level.