Table 1.

Demographic and clinical characteristics of the preperimetric glaucoma and control study groups

Characteristics	Glaucoma (n=48)	Control (n=86)	P Value
Age, years *	66.1 ± 9.3	63.6 ± 10.8	0.238
Gender, % male	50.0	32.6	0.097
Ancestry, % African-American	16.6	4.3	0.057
MD, dB†	−0.63 ± 1.24	0.09 ± 1.33	0.002
PSD, dB†	1.61 (1.43, 1.56, 1.77)	1.55 (1.28, 1.46, 1.70)	0.136
Disc area, mm2 *	1.97 ± 0.08	1.97 ± 0.06	0.927
Intraocular pressure, mmHg *	19.77 ± 0.56	19.97 ± 0.70	0.825
Signal strength of the Spectralis SDOCT images *	23.95 ± 0.53	23.58 ± 0.42	0.582
Quality of the HRT-III images, sd†	18.31 (13, 18, 20.5)	17.31(13, 15, 20)	0.212
Follow-up, years *	14.0 ± 3.6	14.9 ± 4.2	0.466
Ametropia, diopters *	−0.81 ± 0.30	−0.70 ± 0.27	0.795
Axial length, mm *	24.09 ± 0.16	24.01 ± 0.15	0.709
Average corneal curvature, mm *	7.72 ± 0.04	7.78 ± 0.03	0.274
Pachymetry, μm *	569.74 ± 6.49	579.14 ± 5.93	0.288

MD = mean deviation

PSD = pattern standard deviation

dB = decibels

SDOCT = spectral domain optical coherence tomography

sd = standard deviation

^*Normally distributed variables; represented by mean (standard deviation).

^†Non-normally distributed variables; represented by mean (first quartile, median, third quartile).