Differences in measurements and their 95% confidence interval (CI), 95% limit of agreement, 95% tolerance for change, and the intraclass correlation coefficients (ICC) and their 95% CI of (i) second reading − first reading of area cup-disc ratio (ACDR) measured with HRT and Discam by observer A, (ii) observer A − observer B estimation of ACDR measured by HRT and Discam, and (iii) HRT − Discam when measuring ACDR by observer A and B
| Differences between measurements (mean (SD)) | 95% confidence interval (CI) | 95% limit of agreement (mean (2SD)) | 95% tolerance for change | ICC (95% CI) | |
|---|---|---|---|---|---|
| HRT ACDR 2nd reading − 1st reading (observer A) | −0.003 (0.047) | −0.015 to 0.009 | −0.1 to 0.009 | 11.04 | 0.97 (0.96 to 0.98) |
| Discam ACDR 2nd reading − 1st reading (observer A) | −0.029 (0.041) | −0.039 to –0.019 | −0.11 to 0.05 | 15.09 | 0.92 (0.76 to 0.97) |
| HRT ACDR (observer A − observer B) | −0.023 (0.043) | −0.033 to −0.013 | −0.11 to 0.063 | 10.46 | 0.97 (0.94 to 0.99) |
| Discam ACDR (observer A − observer B) | −0.029 (0.0770) | −0.047 to −0.011 | −0.18 to 0.125 | 24.54 | 0.79 (0.66 to 0.87) |
| HRT ACDR − Discam ACDR observer A | −0.082 (0.122) | −0.11 to −0.052 | −0.33 to 0.16 | 24.78 | 0.67 (0.33 to 0.82) |
| HRT ACDR − Discam ACDR observer B | −0.075 (0.16) | −0.037 to 0.11 | −0.25 to 0.40 | 46.67 | 0.53 (0.30 to 0.70) |