Table 3. Corneal characteristics of high myopia by axial length.
| Axial length group(mm) | 26–28 | 28–30 | ≥30 | P value | |
|---|---|---|---|---|---|
| n | 56 | 46 | 65 | ||
| Axial length(mm) | Mean±SD | 26.82±0.51 | 28.98±0.62 | 31.95±1.50 | 0.000# |
| Astig. C (D) | Mean±S | 0.96±0.62 | 1.13±0.81 | 1.11±0.69 | 0.500# |
| Range | 0.1, 4.2 | 0.1, 3.6 | 0.1, 3.7 | ||
| Astig. F (D) | Mean±SD | 0.93±0.63 | 1.04±0.81 | 1.01±0.61 | 0.697## |
| Range | 0.1, 4.4 | 0.1, 4 | 0.1, 3.2 | ||
| Astig. B (D) | Mean±SD | -0.25±0.13 | -0.32±0.21 | -0.30±0.18 | 0.396# |
| Range | 0, -0.7 | 0, -0.9 | -0.1, -0.9 | ||
| Diff. (D) | Mean±SD | 0.03±0.20 | 0.09±0.39 | 0.10±0.39 | 0.404# |
| Range | -0.4, 0.4 | -0.6, 1.1 | -0.9, 1.5 | ||
| Astig. type | WTR (C) | 21 | 22 | 23 | 0.392### |
| ATR (C) | 21 | 18 | 31 | ||
| Obl. (C) | 14 | 6 | 11 | ||
| WTR (F) | 28 | 24 | 28 | 0.585### | |
| ATR (F) | 15 | 16 | 23 | ||
| Obl. (F) | 13 | 6 | 14 | ||
| No astig. (B) | 3 | 2 | 0 | 0.126#### | |
| WTR (B) | 45 | 40 | 61 | ||
| ATR (B) | 2 | 3 | 1 | ||
| Obl. (B) | 6 | 1 | 3 |
Astig. = astigmatism value; Diff. = difference, Astig. C–Astig. F; Astig. type = astigmatism type; WTR = with the rule; ATR = against the rule; Obl. = oblique; No astig. = no astigmatism; D = diopters; C = total cornea; F = anterior corneal surface; B = posterior corneal surface; SD = standard deviation.
#Kruskal–Wallis test
##one-way ANOVA
###Pearson’s χ2 test
####Fisher’s exact test