Table 1.

Mean (min-max) serum CAT, GSH, SOD and MDA levels in the keratoconus and control groups.

	Keratoconus (n = 50)	Control (n = 53)	P value	CI 95% min–max
CAT (U/L)	0.075 (0.074–0.078)	0.024 (0.013–0.037)	<0.001	0.049 to 0.053
GSH (mmol/ml)	0.002 (0.001–0.006)	0.029 (0.018–0.049)	<0.001	−0.024 to −0.028
SOD (U/L)	1.56 (1.51–1.62)	4.13 (4.01–4.17)	<0.001	−2.58 to −2.55
MDA (mmol/L)	1.69 (1.65–1.99)	0.74 (0.65–0.82)	<0.001	0.92 to 0.96

CAT Catalase, GSH Reduced glutathione, SOD Superoxide dismutase, MDA Malondialdehyde.