Table 2.

Comparison of epithelial thickness measurements between keratoconus and regular astigmatism groups

Epithelial thickness (µm)a	Keratoconus (n = 208)	Regular astigmatism (n = 188)	p-value
Central	38.55 ± 5.42 (25–55)	48.78 ± 3.94 (41–64)	< .001 *
Temporal	45.75 ± 4.41 (36–60)	42.21 ± 15.28 (36–83)	.318
Superior	47.65 ± 4.49 (37–60)	46.41 ± 3.82 (34–59)	.013 *
Nasal	46.94 ± 4.44 (33–59)	42.42 ± 14.77 (39–72)	.179
Inferior	47.60 ± 5.00 (30–62)	47.63 ± 3.94 (36–59)	.913
∆ Temporal – Central	7.20 ± 5.15 (− 6–25)	− 1.63 ± 4.35 (− 6–19)	< .001 *
∆ Superior – Central	9.10 ± 5.81 (− 5–30)	− 2.13 ± 2.35 (− 10–7)	< .001 *
∆ Nasal – Central	8.39 ± 5.44 (− 5–33)	− 1.43 ± 2.02 (− 8–8)	< .001 *
∆ Inferior – Central	9.05 ± 5.97 (− 6–37)	− 1.03 ± 1.85 (− 8–4)	< .001 *

^aExpressed in mean ± standard deviation (minimum, maximum)

^*Statistically significant level with U of Mann Whitney test for independent data