Table 1.

Baseline characteristics in the cataract surgery and control group in the Ocular Hypertension Treatment Study. Data are presented in mean ± standard deviation unless otherwise noted.

	Cataract surgery group (n=42, 63 eyes)	Control group (n=743, 743 eyes)	p-value*
Age, years	64.1 ± 8.9	55.0 ± 9.4	<0.001
Female, %	66.7	57.6	0.25
African American, %	14.3	25.6	0.10
Some College, %	59.5	67.3	0.30
Central corneal thickness** (microns)	584.7 ± 33.7	574.3 ± 38.4	0.04
Horizontal cup to disc ratio	0.39 ± 0.22	0.36 ± 0.18	0.31
Vertical cup to disc ratio	0.39 ± 0.23	0.39 ± 0.20	0.99
Preoperative intraocular pressure† (mmHg)	23.9 ± 3.2	23.8 ± 3.6	0.88

^*Comparison of the cataract surgery group to the control group using a mixed model analysis of variance or chi-square test as applicable. Eye specific data were adjusted for inter-correlation between the two eyes of a single participant using this mixed effects model with subject number as a random effect.

^****Central corneal thickness measurements were missing for 3 participants in the cataract surgery group and 82 participants in the control group (n=60 in cataract surgery group, and n=661 in control group)

^†Preoperative intraocular pressure (IOP) was the mean IOP of up to 3 visits prior to the visit that cataract surgery was reported, or the mean IOP of up to three visits before the split date in the control group.