Table 1.

Intraindividual-repeatability descriptive statistics for epithelial thickness, as computed by the standard deviation of the respective values obtained by four consecutive acquisitions per eye

		Center	Superior	Inferior	Minimum	Maximum	Topographic variability
Group A KCN (n=160)	Average	1.78	1.92	1.58	1.33	1.72	0.46
	SD	±1.31	±0.99	±1.01	±1.15	±1.30	±0.25
	Maximum	4.50	4.64	4.53	4.29	8.17	1.36
	Minimum	0.02	0.40	0.54	0.25	0.70	0.09
Group B control (n=160)	Average	0.89	1.21	0.73	1.07	1.73	0.19
	SD	±0.75	±0.89	±0.67	±1.02	±1.05	±0.11
	Maximum	2.55	3.41	3.39	4.32	5.07	1.08
	Minimum	0.00	0.10	0.05	0.50	0.70	0.01

Notes: Repeatability is reported for the epithelium at the pupil center (center), superior, inferior, as well as minimum, maximum, and topographic thickness variability. All values are in micrometers.

Abbreviations: KCN, keratoconus; SD, standard deviation.