Table 1.
Retinal oxygen saturation measured with ultrahigh-resolution optical coherence tomography (n = 20)
| ODR SO2 (%) | Session 1 | Session 2 | Mean (S1 S2)/2 | Difference S1 – S2 | 95% limit of agreement* | CR | ICC |
|---|---|---|---|---|---|---|---|
| Artery | 0.79 ± 0.86 (94 ± 45) | 0.88 ± 0.97 (98 ± 51) | 0.84 ± 0.84 (96 ± 44) | −0.09 ± 0.73 (−5 ± 38) | −1.56 to +1.37 (−81 to 72) | 1.44 (75) | 0.680 |
| Vein | −0.08 ± 0.69 (48 ± 36) | 0.14 ± 0.77 (60 ± 40) | 0.03 ± 0.56 (54 ± 29) | −0.22 ± 0.92 (−11 ± 48) | −2.06 to +1.63 (−107 to 85) | 1.81 (94) | 0.196 |
| Artery-vein | 0.87 ± 1.06 (45 ± 55) | 0.74 ± 1.14 (39 ± 59) | 0.81 ± 0.94 (42 ± 49) | 0.13 ± 1.13 (7 ± 59) | −2.13 to +2.38 (−111 to 124) | 2.21 (115) | 0.473 |
Note:
*
95% limit of agreement is calculated as the mean ± 1.96 × SD of the difference between repeated measurements obtained from the same subject by the same observer.
Abbreviations: CR, coefficients of repeatability; ICC, intraclass correlation coefficient; ODR, optical density ratio (mean ± SD); SO2%, oxygen saturation (mean ± SD, %); S1, session 1; S2, session 2; SD, standard deviation.