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. Author manuscript; available in PMC: 2013 Jul 16.
Published in final edited form as: J Cataract Refract Surg. 2009 Sep;35(9):1597–1603. doi: 10.1016/j.jcrs.2009.03.050

Table 2.

Videokeratography indices in the 3 groups at baseline.

Group
Normal KC Suspect Early KC
Variable* n Mean ± SD n Mean ± SD n Mean ± SD
Central K 2138 44.17 ± 1.58 276 45.13 ± 1.87 86 45.97 ± 2.90
I-S 2127 0.57 ± 0.52 277 1.20 ± 0.92 86 4.44 ± 2.76
Log(KISA) 2082 2.49 ± 1.25 258 2.94 ± 1.56 85 5.71 ± 1.65

I–S = inferior–superior; K = keratometry; KC = keratoconus; Log(KISA) = logarithm transformation of keratoconus percentage index; n = number of eyes

*

All P < .05 between normal and keratoconus-suspect groups and between normal and early keratoconus groups for each index