Molecular Vision: You, Mol Vis 2013; 19:509-515. Table 1

Table 1. No significant differences were detected using Chi-Square analysis between gender for control and KC groups, and within KC grades.

Comparison between KC and Control Groups
Group	Gender		Chi-Square
Group	Female	Male	Chi-Square
Control (n=33)	18	15	p=0.971
KC (n=33)	14	19	p=0.971
Comparison within KC grades
KC Grade*	Gender		Chi-Sqaure
KC Grade*	Female	Male	Chi-Sqaure
1	0	1	p=0.950
2	4	6
3	4	4
4	6	8
Total	14	19

*KC Grade Grade 1: subclinical form diagnosed by corneal topography; ~6/6VA (Visual Acuity) with spectacle correction. Grade 2: early form; mild corneal thinning; corneal scarring absent. Grade 3: moderate form; corneal scarring and opacities absent; Vogt’s striae; Fleischer’s ring; <6/6 VA with spectacle correction, but ~6/6VA with contact lens correction; irregular astigmatism 2.00 to 8.00D; significant corneal thinning. Grade 4: severe form; <6/7.5 VA with contact lens correction; severe corneal thinning and Munson’s sign.