Table 1.

Demographic characteristics of the study groups.

	Normal	SKC	KC	ANOVA	P values
Patients (n)	65	43	36		SKC vs. normal	KC vs. normal	KC vs. SKC
Sex
F	41	18	17
M	24	25	19
Age (years) (mean ± SD)	27.03 ± 8.43	27.7 ± 6.82	26.49 ± 6.12	0.79
Sphere (D) (mean ± SD)	−0.47 ± 2.70	−0.11 ± 1.15	−0.76 ± 1.88	0.43
Cylinder (D) (mean ± SD)	−0.59 ± 1.61	−1.14 ± 1.26	−2.72 ± 1.90	<0.0001	0.26	<0.0001	<0.0001

SKC = suspect keratoconus; KC = keratoconus; n = number; F = female; M = male; yr = years old; D = diopter; SD = standard deviation. Statistically significant values (P  <  0.05). Values in bold are statistically significant.