Table 3.
The Bland-Altman 95% limits agreement and intraclass correlation coefficient for total astigmatism.
| Parameter | Mean difference (standard deviation) | Bland-Altman 95% limits of agreement |
p value | ICC 95% confidence interval |
|---|---|---|---|---|
| Autorefraction versus subjective | 0.19 (0.54) | −0.87 to 1.25 | 0.039 | 0.92 (0.84–0.96) |
| Retinoscopy versus subjective | 0.25 (0.89) | −1.49 to 1.99 | 0.1 | 0.85 (0.699–0.921) |
| Javal's rule versus subjective | 0.6 (0.68) | −0.73 to 1.93 | <0.001 | 0.82 (0.23–0.93) |
| Grosvenor's modification versus subjective | 0.4 (0.66) | −0.89 to 1.7 | 0.01 | 0.85 (0.6–0.933) |
| Autorefraction versus retinoscopy | 0.06 (0.62) | −0.6 to 1.2 | 0.5 | 0.92 (0.857–0.963) |