Risk Factors for Glaucoma Suspicion in Healthy Young Asian and Caucasian Americans

Table 1

Demographic and ocular characteristics (mean ± standard deviation) for all subjects, the Asian American subgroup, and Caucasian American subgroup. RNFL: retinal nerve fiber layer. All optical coherence tomography (OCT) measurements were taken with the RTVue-100 Fourier-domain OCT.

	All subjects	Asian Americans	Caucasian Americans
Variable (mean ± SD)	𝑛=120	𝑛=54	𝑛=41
Age in years	24.83 ± 2.99	24.35 ± 3.02	25.48 ± 2.36
Female	73/120 (61%)	33/54 (61%)	30/41 (72%)
Spherical equivalent (D)	−3.81 ± 3.19	−5.57 ± 3.38	−2.67 ± 2.23
IOP (mmHg)	13.83 ± 3.05	15.24 ± 3.2	12.65 ± 2.3
Disc area (mm)	1.92 ± 0.52	2.00 ± 0.54	1.84 ± 0.50
Cup area (mm)	0.55 ± 0.47	0.63 ± 0.50	0.45 ± 0.38
Rim area (mm)	1.37 ± 0.42	1.37 ± 0.42	1.40 ± 0.41
Rim volume (mm^3)	0.21 ± 0.14	0.21 ± 0.15	0.23 ± 0.13
Cup volume (mm^3)	0.10 ± 0.14	0.13 ± 0.18	0.06 ± 0.08
Cup to disc area ratio	0.27 ± 0.19	0.30 ± 0.18	0.23 ± 0.18
Horizontal cup to disc ratio	0.55 ± 0.25	0.62 ± 0.19	0.46 ± 0.28
Vertical cup to disc ratio	0.47 ± 0.23	0.51 ± 0.20	0.42 ± 0.26
RNFL thickness (μm)	109.49 ± 11.1	112.51 ± 9.46	107.13 ± 12.8
Superior hemisphere thickness (μm)	106.98 ± 16.2	111.67 ± 10.7	104.75 ± 14.5
Inferior hemisphere thickness (μm)	111.10 ± 11.5	113.35 ± 10.2	109.56 ± 13.1
Central corneal thickness (μm)	530 ± 40	530 ± 40	540 ± 40
Axial length (mm)	25.1 ± 0.04	25.81 ± 0.64	24.62 ± 1.66
Anterior chamber depth (mm)	3.34 ± 0.25	3.33 ± 0.28	3.36 ± 0.22