Table 3 The means and standard deviations for CCT measurements obtained using the SP-2000P and z-ring CS4, intra-observer repeatability, inter-observer reproducibility (z-ring CS4 only), and comparison between SP-2000P vs. z-ring CS4 (mean differences, limits of agreement, paired t -test, un-paired test, and p-values)
Analysis of CCT values | Observer 1 | Observer 2 | ||
|---|---|---|---|---|
USP | SP-2000P | z-ring CS4 | z-ring CS4 | |
Mean ± SD* | 555.11 ± 35.83 | 535.82 ± 41.10 | 552.57 ± 36.83 | 554.97 ± 36.34 |
Intra-observer repeatability (p-value) | 0.91 | 0.20 | 0.45 | 0.54 |
Mean difference ± SD* | Limits of agreement | p-value | ||
Inter-observer reproducibility with z-ring CS4** | -2.40 ± 9.10 | +39.90, -38.70 | 0.16 | |
USP vs. SP-2000P | 19.30 ± 19.60 | +57.70, -19.20 | ||
USP vs. z-ring CS4 | 2.50 ± 5.70 | +16.30, -11.20 | ||
SP-2000P vs. z-ring CS4 | -16.70 ± 18.60 | +23.70, -57.20 | ||