Table 1.
Cylinder refraction and axis of CSA children in different age groups.
| Age (y) | Cylinder refractiona (D) | P value∗ | Axis of astigmatismb (≤−0.75 D) | P value# | ||
|---|---|---|---|---|---|---|
| WTR | ATR | OBL | ||||
| 6 | −1.38 ± 0.85 | 0.67 | 66 (78.6%) | 2 (2.4%) | 16 (19.0%) | 0.7 |
| 7 | −1.34 ± 0.78 | 88 (72.7%) | 6 (5.0%) | 27 (22.3%) | ||
| 8 | −1.47 ± 0.78 | 79 (79.0%) | 3 (3.0%) | 18 (18.0%) | ||
| 9 | −1.38 ± 0.71 | 16 (72.7%) | 0 (0.0%) | 6 (27.3%) | ||
D, diopters; y, years; WTR, with-the-rule; ATR, against-the-rule; OBL, oblique. aMeans ± standard deviations; bnumber of eyes (%); ∗ANOVA; # χ 2 test.