Table 2.
Bland and Altman analysis of central corneal thickness measurements obtained by SP-3000P, Artemis-2, and DGH-500 ultrasound pachymetry
| Techniques | Mean difference (μm) | SD | 95% CI (μm) | P value | CoR |
|---|---|---|---|---|---|
| SP-3000Pa | −0.9 | 4.7 | −10.0 to 8.2 | >0.05 | ± 9.1 |
| SP-3000Pb | −0.9 | 5.5 | −11.6 to 9.9 | ± 10.8 | |
| Artemis-2a | −0.5 | 4.1 | −8.6 to 7.6 | >0.05 | ± 8.1 |
| Artemis-2b | −0.9 | 4.6 | −9.9 to 8.1 | ± 9.0 | |
| DGH-500a | 0.6 | 6.3 | −11.8 to 13.0 | >0.05 | ± 12.4 |
| DGH-500b | −1.7 | 6.2 | −13.9 to 10.4 | ± 12.1 |
Notes: Mean difference within session, standard deviations, 95% confidence intervals (mean ± 1.96 SD) in each technique with their CoR* are represented. P value is the between-observer paired t-test analysis.
a
SP-3000P is first session measurement;
b
SP-3000P is second session measurement;
*
statistically significant at the 0.05.
Abbreviations: CI, confidence interval; CoR, coefficients of repeatability; SD, standard deviation.