Table 4.

Final models for central K, I–S and KISA comparing the 3 groups by the mixed model at a 0.10 significance level.

Index	Model
Central K	44.17 + 0.005 × Time + 0.12 × KC Suspect + 1.42 × Early KC − 0.60 × Female + 0.63 × Family History − 0.26 × Black − 0.31 × Hispanic − 0.39 × Other
I-S	0.28 + 0.006 × Time + 0.28 × KC Suspect + 2.58 × Early KC + 0.24 × Family History
Log(KISA)	2.33 + 0.010 × Time + 0.10 × KC Suspect + 2.59 × Early KC + 0.22 × Female + 0.22 × Family History + 0.06 × Black − 0.15 × Hispanic − 0.04 × Other

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