Table 3.

Threshold Effect Analysis on Risk of Keratoconus

Variables in Model	OR (95% CI)	P-value
Discrepancy CCT vs TCT (μm)
< 5	0.72 (0.51, 1.00)	0.051
≥ 5	2.53 (1.67, 3.85)	<0.001
Discrepancy ACT vs TCT (μm)
< 3	0.59 (0.35, 1.01)	0.056
≥ 3	1.41 (1.15, 1.73)	0.001
Distance CCT vs TCT# (mm)
< 0.65	0.55 (0.37, 0.83)	0.004
≥ 0.65	1.66 (1.20, 2.30)	0.002

Note: ^#Every 0.1 unit increase.

Abbreviations: Discrepancy CCT vs TCT, absolute value of discrepancy between central corneal thickness and thinnest corneal thickness; Discrepancy ACT vs TCT, absolute value of discrepancy between apex corneal thickness and thinnest corneal thickness; Distance CCT vs TCT, absolute value of vector distance between central corneal thickness and thinnest corneal thickness.