Table 2.
Mean, standard deviation (SD), and intraclass correlation coefficient (ICC) of curvature readings by Orbscan in 5 corneal rings [curvature unit: diopter (D)].
| First measurement |
Second measurement |
Third measurement |
ICC | P-valuea | |
|---|---|---|---|---|---|
| Mean ± SD | Mean ± SD | Mean ± SD | |||
| 1 mm ring | 3.19 ± 47.59 | 3.21 ± 47.63 | 3.26 ± 47.52 | 0.99 | 0.30 |
| 2 mm ring | 3.05 ± 47.40 | 3.04 ± 47.40 | 3.12 ± 47.29 | 0.99 | 0.27 |
| 3 mm ring | 2.87 ± 47.00 | 2.89 ± 47.02 | 2.91 ± 46.92 | 0.99 | 0.26 |
| 4 mm ring | 2.67 ± 46.52 | 2.69 ± 46.51 | 2.73 ± 46.46 | 0.95 | 0.56 |
| 5 mm ring | 2.50 ± 45.97 | 2.55 ± 46.04 | 2.63 ± 46.01 | 0.99 | 0.67 |
ICC: Intraclass correlation coefficient; SD: Standard deviation.
a
The P-value was calculated by Repeated Measures ANOVA.