Table 3. Summary of descriptive statistics and paired-sample t-test of the central subfield (C) thickness of Stratus and Spectralis OCT measurements, and Spectralis-predicted values in eyes with DME.
|
Descriptive statistics | ||||||
|---|---|---|---|---|---|---|
| N | Minimum | Maximum | Mean | SE | SD | |
| CStratus (measured thickness) | 130 | 247 | 849 | 426 | 11.39 | 129.82 |
| CSpectralis (measured thickness) | 130 | 289 | 903 | 487 | 11.15 | 127.11 |
| CSpectralis (matched locations) | 130 | 304 | 903 | 488 | 11.13 | 126.92 |
| CSpectralis (predicted values) | 130 | 327 | 946 | 511 | 11.72 | 133.60 |
|
Paired sample t-test | |||||||||
|---|---|---|---|---|---|---|---|---|---|
|
Paired correlation |
Paired differences |
||||||||
| N | Correlation | Sig. | Mean | SD | SE |
CI95
of difference |
|||
| Lower | Upper | Sig. | |||||||
| CStratus vs CSpectralis (measured thickness) | 130 | 0.987 | 0.000 | –61 | 21.23 | 1.86 | –64 | –57 | 0.000 |
| CStratus vs CSpectralis (matched locations) | 130 | 0.994 | 0.000 | –62 | 14.75 | 1.29 | –65 | –60 | 0.000 |
| CSpectralis (matched locations) vs CSpectralis (predicted values) | 130 | 0.987 | 0.000 | –24 | 22.33 | 1.96 | –28 | –20 | 0.000 |
| CSpectralis (matched locations) vs CSpectralis (predicted values) | 130 | 0.994 | 0.000 | –23 | 16.12 | 1.41 | –25 | –20 | 0.000 |
Abbreviations: CI95, 95% confidence interval; N, number; SE, standard error; SD, standard deviation.