Analysis of Choroidal Vascularity Index in Keratoconus Patients Using Swept-Source Optical Coherence Tomography-Based Binarization Techniques

Table 4

Vascular coefficients by age group.

		KC	Control	KC-control (95% CI)	value
1^st tertile, from 14 to 35 years (n = 92, KC: 60, control: 32)	CA (mm^2)	2.11	0.57	+1.55 (1.41 to 1.68)	<0.0001
	SR (mm^2)	0.86	0.26	+0.60 (0.54 to 0.66)	<0.0001
	VR (mm^2)	1.23	0.31	+0.93 (0.84 to 1.01)	<0.0001
	CCV (%)	58.36	54.78	+3.58 (1.17 to 5.99)	0.004
2^nd tertile, from 36 to 53 years (n = 72, KC: 32, control: 40)	CA (mm^2)	1.69	0.50	+1.19 (1.00 to 1.38)	<0.0001
	SR (mm^2)	0.74	0.25	+0.49 (0.41 to 0.57)	<0.0001
	VR (mm^2)	0.93	0.25	+0.68 (0.57 to 0.79)	<0.0001
	CCV (%)	54.51	49.50	+5.01 (2.70 to 7.32)	0.0001
3^rd tertile, from 54 to 85 years (n = 78, KC: 5, control: 73)	CA (mm^2)	0.98	0.47	+0.51 (0.14 to 0.88)	0.02
	SR (mm^2)	0.48	0.25	+0.23 (0.07 to 0.38)	0.02
	VR (mm^2)	0.49	0.22	+0.27 (0.03 to 0.50)	0.03
	CCV (%)	48.83	46.99	+1.84 (-5.20 to 8.87)	0.53

Comparison of vascular coefficients between keratoconic patients and healthy controls by tertiles of age (in years). The groups do not contain exactly the same number of subjects because there were some cases with exactly the same value for age used to separate categories. Results represent mean (standard deviation) except when indicated. CA: choroidal area; CCV: corrected choroidal percent of vascularity; KC: keratoconus; SR: stromal region; VR: vascular region.