Table 3.
Subclassification of Stage 1 keratoconus based on steep keratometry
| Epithelial thickness (µm)a | Stage I Subclassification A1 46 D > Steep K (n = 105) |
Stage I Subclassification B1 48 D > Steep K ≥ 46 D (n = 44) |
p-value |
|---|---|---|---|
| Central | 40.54 ± 5.55 (25–55) | 38.52 ± 4.82 (30–55) | .024* |
| Temporal | 46.13 ± 4.24 (36–58) | 45.75 ± 4.00 (37–55) | .688 |
| Superior | 47.75 ± 4.15 (39–58) | 48.39 ± 4.61 (41–60) | .495 |
| Nasal | 47.01 ± 4.34 (39–58) | 47.50 ± 3.05 (40–55) | .319 |
| Inferior | 47.70 ± 5.34 (30–62) | 47.64 ± 4.34 (33–56) | .889 |
| ∆ Temporal—Central | 5.59 ± 4.85 (− 6–25) | 7.23 ± 5.11 (− 5–19) | .029* |
| ∆ Superior—Central | 7.21 ± 5.17 (− 2–30) | 9.86 ± 6.82 (− 5–24) | .009* |
| ∆ Nasal—Central | 6.47 ± 5.13 (− 5–33) | 8.98 ± 4.92 (− 5–21) | < .001* |
| ∆ Inferior—Central | 7.15 ± 5.60 (− 4–37) | 9.11 ± 5.95 (− 6–21) | .020* |
1Based on stage I Steep K and refraction range definition of Amsler-Krumeich classification
aExpressed in mean ± standard deviation (minimum, maximum)
*Statistically significant level with U of Mann Whitney test for independent data